problemset.md

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همه سوالات

??? warning "نیاز به عضویت در گروه شاززز!"

برای حل برخی از سوالات باید ابتدا در [گروه شاززز](https://quera.org/course/add_to_course/course/12879/){:target="_blank"} عضو شوید.

??? warning "حاوی سوالات المپیاد کامپیوتر ایران!"

سوالات المپیادی از دوره های سابق المپیاد کامپیوتر ایران است، توصیه میشود اگر میخواهید این آزمون ها را در آینده بدهید آنها را باز نکنید!

| سوال | سختی | تگ ها | جاج | | :-----: | :----: | :----: | :----: | |[a + b](https://codeforces.com/problemsets/acmsguru/problem/99999/100){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[فاکتوریل](https://quera.org/problemset/589/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}
• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[اعداد فیثاغورثی](https://quera.org/problemset/9774/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[Distinc Digits](https://codeforces.com/contest/1228/problem/A){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[مثلث خیام پاسکال](https://quera.org/problemset/3410/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[توان ۲](https://quera.org/problemset/616/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[چاپ لوزی](https://quera.org/problemset/618/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[عدد خود مغلوب](https://quera.org/problemset/617/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[لوزی های ستاره ای](https://quera.org/problemset/9773/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[تک رقمی](https://quera.org/problemset/3539/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[مبنا](https://quera.org/problemset/594/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[مسابقه پیاده سازی کوئرا(همه سوالات)](https://quera.org/contest/assignments/42708/problems/){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[مسابقه پیاده سازی کوئرا(همه سوالات)](https://quera.org/contest/assignments/35049/problems){:target="_blank"}|800|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[الگویابی](https://quera.org/course/assignments/48772/problems/166209){:target="_blank"}|800|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[Guess The Number](https://oj.uz/problem/view/BOI20_guess){:target="_blank"}|800|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Subsequence Permutation](https://codeforces.com/problemset/problem/1552/A){:target="_blank"}|800|

Spoiler

• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Merge Sort](https://www.spoj.com/problems/MERGSORT/){:target="_blank"}|800|

Spoiler

• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-spoj: [Spoj](https://spoj.com/){:target="_blank"}| |[Prefix Sum Queries](https://cses.fi/problemset/task/2166){:target="_blank"}|800|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[ایکسور خفن](https://quera.org/course/assignments/48772/problems/168588){:target="_blank"}|800|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[Sum of Three Values](https://cses.fi/problemset/task/1641){:target="_blank"}|800|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[پریش](https://quera.org/course/assignments/48772/problems/166207){:target="_blank"}|900|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[Permutations](https://leetcode.com/problems/permutations/){:target="_blank"}|900|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-leetcode: [LeetCode](https://leetcode.com/){:target="_blank"}| |[Generate Parentheses](https://leetcode.com/problems/generate-parentheses/){:target="_blank"}|900|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-leetcode: [LeetCode](https://leetcode.com/){:target="_blank"}| |[Distinct Numbers](https://cses.fi/problemset/task/1621){:target="_blank"}|900|

Spoiler

• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Max Subarray Sum](https://cses.fi/problemset/task/1643){:target="_blank"}|900|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[a^b - b^a](https://codeforces.com/problemsets/acmsguru/problem/99999/112){:target="_blank"}|1000|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Spam Filter](https://codeforces.com/problemsets/acmsguru/problem/99999/274){:target="_blank"}|1000|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Lexicographic permutations](https://projecteuler.net/problem=24){:target="_blank"}|1000|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|[Project Euler](https://projecteuler.net/){:target="_blank"}| |[کاشی‌کاری ](https://quera.org/problemset/605/){:target="_blank"}|1000|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[بی‌ فاصله](https://quera.org/course/assignments/48772/problems/166206){:target="_blank"}|1000|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[جم‌زی](https://quera.org/course/assignments/48772/problems/166208){:target="_blank"}|1000|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[اول‌دایره](https://quera.org/course/assignments/48772/problems/166211){:target="_blank"}|1000|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[شتر](https://quera.org/course/assignments/48772/problems/166212){:target="_blank"}|1000|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[1000-digit Fibonacci number](https://projecteuler.net/problem=25){:target="_blank"}|1000|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}
• [پیاده سازی](/Level1/implementation){:target="_blank"}

|[Project Euler](https://projecteuler.net/){:target="_blank"}| |[Combinations](https://leetcode.com/problems/combinations/){:target="_blank"}|1000|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}
• combinatorics

|:judge-leetcode: [LeetCode](https://leetcode.com/){:target="_blank"}| |[Printed PR](https://codeforces.com/problemsets/acmsguru/problem/99999/259){:target="_blank"}|1000|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Fedor and new game](https://codeforces.com/problemset/problem/467/B){:target="_blank"}|1100|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Subarray Sums II](https://cses.fi/problemset/task/1661){:target="_blank"}|1100|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}
• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Ilya and Queries](https://codeforces.com/problemset/problem/313/B){:target="_blank"}|1100|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Forest Queries](https://cses.fi/problemset/task/1652){:target="_blank"}|1100|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Ice Skating](https://codeforces.com/problemset/problem/217/A){:target="_blank"}|1200|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Petr and a Combination Lock](https://codeforces.com/contest/1097/problem/B){:target="_blank"}|1200|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Next Permutation](https://leetcode.com/problems/next-permutation/){:target="_blank"}|1200|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-leetcode: [LeetCode](https://leetcode.com/){:target="_blank"}| |[Easy modified sudoku](https://www.spoj.com/problems/EZSUDOKU/){:target="_blank"}|1200|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-spoj: [Spoj](https://spoj.com/){:target="_blank"}| |[Born this way](https://codeforces.com/problemset/problem/1148/B){:target="_blank"}|1200|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[A Tale of Two Lands](https://codeforces.com/problemset/problem/1166/C){:target="_blank"}|1200|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Telecasting station](https://codeforces.com/problemsets/acmsguru/problem/99999/114){:target="_blank"}|1200|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Great Sequence](https://codeforces.com/contest/1641/problem/A){:target="_blank"}|1200|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[New Year's Eve](https://codeforces.com/problemset/problem/912/B){:target="_blank"}|1300|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Factorial digit sum](https://projecteuler.net/problem=20){:target="_blank"}|1300|

Spoiler

• [پیاده سازی](/Level1/implementation){:target="_blank"}

|[Project Euler](https://projecteuler.net/){:target="_blank"}| |[Little Queens](https://codeforces.com/problemsets/acmsguru/problem/99999/224){:target="_blank"}|1300|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Knapsack](https://codeforces.com/contest/1447/problem/C){:target="_blank"}|1300|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[فاصله گذاری اجتماعی](https://quera.org/course/assignments/48772/problems/168592){:target="_blank"}|1300|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[Preparing Olympiad](https://codeforces.com/contest/550/problem/B){:target="_blank"}|1400|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Number Game](https://codeforces.com/problemset/problem/1749/C){:target="_blank"}|1400|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[out of sorts](http://www.usaco.org/index.php?page=viewproblem2&cpid=834){:target="_blank"}|1400|

Spoiler

• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-usaco: [Usaco](https://usaco.org){:target="_blank"}| |[The Towers of Hanoi Revisited](https://codeforces.com/problemsets/acmsguru/problem/99999/202){:target="_blank"}|1500|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Fixed Point Guessing](https://codeforces.com/problemset/problem/1698/D){:target="_blank"}|1500|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Magic Powder 2](https://codeforces.com/problemset/problem/670/D2){:target="_blank"}|1500|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Vasya and String](https://codeforces.com/contest/676/problem/C){:target="_blank"}|1500|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Mysterious Crime](https://codeforces.com/problemset/problem/1043/D){:target="_blank"}|1500|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[رژیم جسی](https://quera.org/course/assignments/48772/problems/168589){:target="_blank"}|1500|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[Zero Array](https://codeforces.com/problemset/problem/1201/B){:target="_blank"}|1500|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Graph Paths I](https://cses.fi/problemset/task/1723){:target="_blank"}|1600|

Spoiler

• matrix

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Graph Paths II](https://cses.fi/problemset/task/1724){:target="_blank"}|1600|

Spoiler

• matrix

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Walk](https://atcoder.jp/contests/dp/tasks/dp_r){:target="_blank"}|1600|

Spoiler

• matrix

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Inversions](https://codeforces.com/problemsets/acmsguru/problem/99999/180){:target="_blank"}|1600|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}
• fenwick
• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[NEGCYC](https://www.spoj.com/problems/NEGCYC/){:target="_blank"}|1600|

Spoiler

• bellman

|:judge-spoj: [Spoj](https://spoj.com/){:target="_blank"}| |[Algorace](https://codeforces.com/problemset/problem/187/B){:target="_blank"}|1600|

Spoiler

• floyd

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Game Routes](https://cses.fi/problemset/task/1681){:target="_blank"}|1600|

Spoiler

• topol_sort

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Mafia](https://codeforces.com/problemset/problem/348/A){:target="_blank"}|1600|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Hamburgers](https://codeforces.com/problemset/problem/371/C){:target="_blank"}|1600|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Tree Infectoin](https://codeforces.com/contest/1665/problem/C){:target="_blank"}|1600|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Keshi Is Throwing a Party](https://codeforces.com/problemset/problem/1610/C){:target="_blank"}|1600|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Star sky](https://codeforces.com/contest/835/problem/C){:target="_blank"}|1600|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Same Count One](https://codeforces.com/problemset/problem/1774/D){:target="_blank"}|1600|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Binary String](https://codeforces.com/problemset/problem/1680/C){:target="_blank"}|1600|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Longest k-Good Segment](https://codeforces.com/problemset/problem/616/D){:target="_blank"}|1600|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Equal Frequencies](https://codeforces.com/contest/1782/problem/C){:target="_blank"}|1600|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Basketball](https://codeforces.com/problemsets/acmsguru/problem/99999/165){:target="_blank"}|1600|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Two Arrays and Sum of Functions](https://codeforces.com/problemset/problem/1165/E){:target="_blank"}|1600|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[secrets](https://codeforces.com/problemset/problem/333/A){:target="_blank"}|1600|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Greg and Graph](https://codeforces.com/problemset/problem/296/D/){:target="_blank"}|1700|

Spoiler

• floyd

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Meteors](https://szkopul.edu.pl/problemset/problem/7JrCYZ7LhEK4nBR5zbAXpcmM/site/?key=statement){:target="_blank"}|1700|

Spoiler

• pbs

|[SZKopul](https://szkopul.edu.pl){:target="_blank"}| |[Longest Flight Route](https://cses.fi/problemset/task/1680){:target="_blank"}|1700|

Spoiler

• topol_sort

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Xor Guessing](https://codeforces.com/problemset/problem/1207/E){:target="_blank"}|1700|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[AND, OR and square sum](https://codeforces.com/contest/1368/problem/D){:target="_blank"}|1700|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[String game](https://codeforces.com/problemset/problem/778/A){:target="_blank"}|1700|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Searching Local Minimum](https://codeforces.com/problemset/problem/1479/A){:target="_blank"}|1700|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Worm Worries - sub 1 - 2](https://oj.uz/problem/view/BOI18_worm){:target="_blank"}|1700|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• golden_ratio

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Increasing by Modulo](https://codeforces.com/problemset/problem/1169/C){:target="_blank"}|1700|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Remove the Substring (hard version)](https://codeforces.com/problemset/problem/1203/D2){:target="_blank"}|1700|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Xenia and Colorful Gems](https://codeforces.com/problemset/problem/1336/B){:target="_blank"}|1700|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Magic Gems](https://codeforces.com/contest/1117/problem/D){:target="_blank"}|1800|

Spoiler

• matrix

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Pashmak and Parmida's problem](https://codeforces.com/problemset/problem/459/D){:target="_blank"}|1800|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}
• fenwick

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Graph Without Long Directed Paths](https://codeforces.com/contest/1144/problem/F){:target="_blank"}|1800|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Apollo versus Pan](https://codeforces.com/contest/1466/problem/E){:target="_blank"}|1800|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Xor](https://codeforces.com/problemset/problem/194/D){:target="_blank"}|1800|

Spoiler

• [توابع بازگشتی](/Level1/recursive){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Renting bikes](https://codeforces.com/problemset/problem/363/D){:target="_blank"}|1800|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Elevator](https://codeforces.com/problemsets/acmsguru/problem/99999/379){:target="_blank"}|1800|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Multiplication Table](https://codeforces.com/problemset/problem/448/D/){:target="_blank"}|1800|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Multiplication Table](https://codeforces.com/problemset/problem/448/D){:target="_blank"}|1800|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Boboniu Chats with Du](https://codeforces.com/contest/1394/problem/A){:target="_blank"}|1800|

Spoiler

• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}
• tow_pointers

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Ring Road 2](https://codeforces.com/problemset/problem/27/D){:target="_blank"}|1900|

Spoiler

• 2_sat

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Data Center Drama](https://codeforces.com/problemset/problem/527/E){:target="_blank"}|1900|

Spoiler

• euler_tour

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Once Again](https://codeforces.com/contest/582/problem/B){:target="_blank"}|1900|

Spoiler

• matrix

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Enemy Is Weak](https://codeforces.com/problemset/problem/61/E){:target="_blank"}|1900|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}
• fenwick
• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Roads In Berland](https://codeforces.com/problemset/problem/25/C){:target="_blank"}|1900|

Spoiler

• floyd

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Subtree K-th Max](https://atcoder.jp/contests/abc239/tasks/abc239_e){:target="_blank"}|1900|

Spoiler

• dfs

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Vasya and a tree](https://codeforces.com/contest/1076/problem/E){:target="_blank"}|1900|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Read Time](https://codeforces.com/problemset/problem/343/C){:target="_blank"}|1900|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Memory for Arrays](https://codeforces.com/problemset/problem/309/C){:target="_blank"}|1900|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Guess The String](https://codeforces.com/problemset/problem/1697/D){:target="_blank"}|1900|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[MinOr Tree](https://codeforces.com/contest/1624/problem/G){:target="_blank"}|1900|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Postmen](https://oj.uz/problem/view/BOI14_postmen){:target="_blank"}|2000|

Spoiler

• euler_tour

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Wet Shark and Blocks](https://codeforces.com/contest/621/problem/E){:target="_blank"}|2000|

Spoiler

• matrix

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Subsequence](https://codeforces.com/contest/597/problem/C){:target="_blank"}|2000|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}
• fenwick

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Edge Deletion](https://atcoder.jp/contests/abc243/tasks/abc243_e){:target="_blank"}|2000|

Spoiler

• floyd

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Book of Evil](https://codeforces.com/contest/337/problem/d){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Ant on the Tree](https://codeforces.com/problemset/problem/29/D?locale=en){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Number of Simple Paths](https://codeforces.com/contest/1454/problem/E){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Computer Network](https://codeforces.com/problemsets/acmsguru/problem/99999/149){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Wormhole Sort](http://www.usaco.org/index.php?page=viewproblem2&cpid=992v){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-usaco: [Usaco](https://usaco.org){:target="_blank"}| |[Where's Bessie?](http://www.usaco.org/index.php?page=viewproblem2&cpid=740){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-usaco: [Usaco](https://usaco.org){:target="_blank"}| |[Minimal Diameter Forest](https://codeforces.com/contest/1092/problem/E){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Milk Visits](http://www.usaco.org/index.php?page=viewproblem2&cpid=968){:target="_blank"}|2000|

Spoiler

• dfs

|:judge-usaco: [Usaco](https://usaco.org){:target="_blank"}| |[Cycle](https://codeforces.com/contest/117/problem/c){:target="_blank"}|2000|

Spoiler

• digraph

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Giving Award](https://codeforces.com/contest/412/problem/D){:target="_blank"}|2000|

Spoiler

• topol_sort

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Flight Routes Check ](https://cses.fi/problemset/task/1682){:target="_blank"}|2000|

Spoiler

• digraph

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[Course Schedule](https://quera.org/course/assignments/48772/problems/164976){:target="_blank"}|2000|

Spoiler

• topol_sort

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[Castle Defense](https://codeforces.com/problemset/problem/954/G){:target="_blank"}|2000|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Minimizing Difference](https://codeforces.com/problemset/problem/1244/E){:target="_blank"}|2000|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [Two Pointers](/Level1/two_pointers){:target="_blank"}
• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Interacdive Problem](https://codeforces.com/problemset/problem/1624/F){:target="_blank"}|2000|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Gluttony](https://codeforces.com/problemset/problem/892/D){:target="_blank"}|2000|

Spoiler

• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Project Planning](https://atcoder.jp/contests/abc227/tasks/abc227_d){:target="_blank"}|2000|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[National Property](https://codeforces.com/contest/876/problem/E){:target="_blank"}|2100|

Spoiler

• 2_sat

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Mike and Fish](https://codeforces.com/problemset/problem/547/D){:target="_blank"}|2100|

Spoiler

• euler_tour

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Good Vertices](https://atcoder.jp/contests/abc236/tasks/abc236_g){:target="_blank"}|2100|

Spoiler

• matrix

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Long Grid Covering](https://codeforces.com/gym/103098/problem/L){:target="_blank"}|2100|

Spoiler

• matrix

|:judge-codeforces: [Gym](https://codeforces.com/gyms){:target="_blank"}| |[Ela and the Wiring Wizard](https://codeforces.com/problemset/problem/1737/D){:target="_blank"}|2100|

Spoiler

• floyd

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Construct Highway](https://atcoder.jp/contests/abc239/tasks/abc239_f){:target="_blank"}|2100|

Spoiler

• dfs

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Mahmoud and a xor trip](https://codeforces.com/problemset/problem/766/E){:target="_blank"}|2100|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Blood Cousins](https://codeforces.com/problemset/problem/208/E){:target="_blank"}|2100|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Leha and another game about graph](https://codeforces.com/contest/841/problem/D){:target="_blank"}|2100|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Bertown roads](https://codeforces.com/contest/118/problem/E){:target="_blank"}|2100|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Graph](https://codeforces.com/contest/1387/problem/A){:target="_blank"}|2100|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Fox And Names](https://codeforces.com/problemset/problem/510/C){:target="_blank"}|2100|

Spoiler

• topol_sort

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Characteristics of Rectangles](https://codeforces.com/problemset/problem/333/D){:target="_blank"}|2100|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• bitset

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Degenerate Matrix](https://codeforces.com/problemset/problem/549/H){:target="_blank"}|2100|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Guess The Maximums](https://codeforces.com/problemset/problem/1363/D){:target="_blank"}|2100|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Matching vs Independent Set](https://codeforces.com/problemset/problem/1198/C){:target="_blank"}|2100|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Minimax](https://codeforces.com/contest/1530/problem/E){:target="_blank"}|2100|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[The Human Equation](https://codeforces.com/problemset/problem/1775/E){:target="_blank"}|2100|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Pokémon Army (hard version)](https://codeforces.com/contest/1420/problem/C2){:target="_blank"}|2100|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}
• dp
• segment

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Best Path](https://www.codechef.com/problems/BESTPATH?tab=statement){:target="_blank"}|2200|

Spoiler

• bellman

|[CodeChef](https://www.codechef.com){:target="_blank"}| |[Little Pony and Summer Sun Celebration](https://codeforces.com/problemset/problem/453/C){:target="_blank"}|2200|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Super M](https://codeforces.com/contest/592/problem/d){:target="_blank"}|2200|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Cycling Coloring](https://codeforces.com/problemset/problem/183/C){:target="_blank"}|2200|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |

[کپی پیست](https://quera.org/problemset/3017/){:target="_blank"}

|2200|

Spoiler

• dfs

|:judge-quera: [المپیادی](https://codeforces.org){:target="_blank"}| |[Count Seconds](https://codeforces.com/contest/1704/problem/E){:target="_blank"}|2200|

Spoiler

• topol_sort

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Mr. Kitayuta's Technology](https://codeforces.com/contest/505/problem/D){:target="_blank"}|2200|

Spoiler

• digraph

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Course Schedule II](https://cses.fi/problemset/task/1757){:target="_blank"}|2200|

Spoiler

• topol_sort

|:judge-cses: [CSES](https://cses.fi){:target="_blank"}| |[GukiZ hates boxes](https://codeforces.com/problemset/problem/551/C){:target="_blank"}|2200|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}
• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Professor GukiZ and Two Arrays](https://codeforces.com/problemset/problem/620/D){:target="_blank"}|2200|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Weakness and Poorness](https://codeforces.com/problemset/problem/578/C){:target="_blank"}|2200|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Restorer Distance](https://codeforces.com/problemset/problem/1355/E){:target="_blank"}|2200|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[New Game Plus!](https://codeforces.com/contest/1456/problem/C){:target="_blank"}|2200|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Fair Share](https://codeforces.com/contest/1634/problem/E){:target="_blank"}|2300|

Spoiler

• euler_tour

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Tanya and Password](https://codeforces.com/problemset/problem/508/D){:target="_blank"}|2300|

Spoiler

• euler_tour

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Fenced In](http://www.usaco.org/index.php?page=viewproblem2&cpid=625){:target="_blank"}|2300|

Spoiler

• kruskal

|:judge-usaco: [Usaco](https://usaco.org){:target="_blank"}| |[Swap and Maximum Block](https://codeforces.com/contest/1716/problem/E){:target="_blank"}|2300|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Yet Another Array Counting Problem](https://codeforces.com/contest/1748/problem/E){:target="_blank"}|2300|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Superset](https://codeforces.com/problemset/problem/97/B){:target="_blank"}|2300|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Wizard's Tour](https://codeforces.com/problemset/problem/858/F){:target="_blank"}|2300|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Graph Cutting](https://codeforces.com/contest/405/problem/E){:target="_blank"}|2300|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Pursuit for artifacts](https://codeforces.com/contest/652/problem/E){:target="_blank"}|2300|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Bitwise Queries (Hard Version)](https://codeforces.com/problemset/problem/1451/E2){:target="_blank"}|2300|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Catowice City](https://codeforces.com/contest/1239/problem/D){:target="_blank"}|2400|

Spoiler

• 2_sat

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Graph Transpositions](https://codeforces.com/problemset/problem/1442/C){:target="_blank"}|2400|

Spoiler

• djikstra

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Axel and Marston in Bitland](https://codeforces.com/contest/780/problem/F){:target="_blank"}|2400|

Spoiler

• matrix

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[لبوی خسته](https://quera.org/course/assignments/48772/problems){:target="_blank"}|2400|

Spoiler

• matrix

|:judge-quera: [Shaazzz](https://quera.org/course/add_to_course/course/12879/){:target="_blank"}| |[Greedy Path](https://codeforces.com/problemsets/acmsguru/problem/99999/236){:target="_blank"}|2400|

Spoiler

• bellman

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Fruit Weights](http://sharecode.io/section/problemset/problem/2730){:target="_blank"}|2400|

Spoiler

• bellman

|[ShareCode](https://sharecode.io/){:target="_blank"}| |[Useful Edges](https://codeforces.com/contest/1482/problem/F){:target="_blank"}|2400|

Spoiler

• floyd

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Stamp Rally](https://atcoder.jp/contests/agc002/tasks/agc002_d){:target="_blank"}|2400|

Spoiler

• pbs
• dsu_tree
• dsu_history

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Blood Cousins Return](https://codeforces.com/problemset/problem/246/E){:target="_blank"}|2400|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Challenging Tic-Tac-Toe](https://codeforces.com/problemsets/acmsguru/problem/99999/289){:target="_blank"}|2400|

Spoiler

• dfs

|:judge-codeforces: [SGU](https://codeforces.com/problemsets/acmsguru){:target="_blank"}| |[Road Problem](https://codeforces.com/contest/45/problem/h){:target="_blank"}|2400|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |

[توپولو‌های به هم چسبیده](https://quera.org/problemset/9857/){:target="_blank"}

|2400|

Spoiler

• topol_sort

|:judge-quera: [المپیادی](https://codeforces.org){:target="_blank"}| |[Plan of lectures](https://codeforces.com/contest/1463/problem/E){:target="_blank"}|2400|

Spoiler

• topol_sort

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Spanning Tree Queries](https://codeforces.com/contest/1633/problem/E){:target="_blank"}|2400|

Spoiler

• mst

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Coins](https://atcoder.jp/contests/agc018/tasks/agc018_c){:target="_blank"}|2400|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[DeadLee](https://codeforces.com/contest/1369/problem/E){:target="_blank"}|2400|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Johnny and Megan's Necklace](https://codeforces.com/contest/1361/problem/C){:target="_blank"}|2500|

Spoiler

• euler_tour

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |

[مدکا](https://quera.org/problemset/2742/){:target="_blank"}

|2500|

Spoiler

• matrix

|:judge-quera: [المپیادی](https://codeforces.org){:target="_blank"}| |[Meeting Her](https://codeforces.com/problemset/problem/238/E){:target="_blank"}|2500|

Spoiler

• bellman

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Anton and School](https://codeforces.com/contest/734/problem/f){:target="_blank"}|2500|

Spoiler

• [عملیات های بیتی](/Level1/bitmask){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Median pyramid hard](https://atcoder.jp/contests/agc006/tasks/agc006_d){:target="_blank"}|2500|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Worm Worries - sub 5 - 6](https://oj.uz/problem/view/BOI18_worm){:target="_blank"}|2500|

Spoiler

• random_algorithm

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Joking (Easy Version)](https://codeforces.com/contest/1746/problem/E1){:target="_blank"}|2500|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Cow Photography](http://www.usaco.org/index.php?page=viewproblem2&cpid=100){:target="_blank"}|2500|

Spoiler

• [مرتب سازی](/Level1/sort){:target="_blank"}

|:judge-usaco: [Usaco](https://usaco.org){:target="_blank"}| |[Reading](https://www.acmicpc.net/problem/7081){:target="_blank"}|2600|

Spoiler

• matrix

|[Baekjoon](https://www.acmicpc.net){:target="_blank"}| |[Flights](https://codeforces.com/problemset/problem/241/E){:target="_blank"}|2600|

Spoiler

• bellman

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Guard Towers](https://codeforces.com/problemset/problem/85/E){:target="_blank"}|2600|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Cycling City](https://codeforces.com/problemset/problem/521/E){:target="_blank"}|2600|

Spoiler

• block_tree

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Unordered Swaps](https://codeforces.com/contest/1682/problem/E){:target="_blank"}|2600|

Spoiler

• topol_sort

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Crossword Puzzle](https://codeforces.com/gym/103104/problem/G){:target="_blank"}|2700|

Spoiler

• 2_sat

|:judge-codeforces: [Gym](https://codeforces.com/gyms){:target="_blank"}| |[Radio Stations](https://codeforces.com/problemset/problem/1215/F){:target="_blank"}|2700|

Spoiler

• 2_sat

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Words on Tree](https://codeforces.com/problemset/problem/1657/F){:target="_blank"}|2700|

Spoiler

• 2_sat

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |

[قورباغه ها](https://quera.org/problemset/2741/){:target="_blank"}

|2700|

Spoiler

• matrix

|:judge-quera: [المپیادی](https://codeforces.org){:target="_blank"}| |[Stairs and Lines](https://codeforces.com/contest/498/problem/E){:target="_blank"}|2700|

Spoiler

• matrix

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Flight for Regular Customers](https://codeforces.com/contest/576/problem/D){:target="_blank"}|2700|

Spoiler

• matrix

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Merchant](https://oj.uz/problem/view/APIO17_merchant){:target="_blank"}|2700|

Spoiler

• bellman

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Capitalism](https://codeforces.com/problemset/problem/1450/E){:target="_blank"}|2700|

Spoiler

• floyd

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[نوشابه خنک](https://quera.org/problemset/62460/){:target="_blank"}|2700|

Spoiler

• pbs

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[Odd Mineral Resource](https://codeforces.com/contest/1479/problem/D){:target="_blank"}|2700|

Spoiler

• pbs
• sweep_line
• mo

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Johnny Solving](https://codeforces.com/problemset/problem/1103/C){:target="_blank"}|2700|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Fairy](https://codeforces.com/contest/19/problem/E){:target="_blank"}|2700|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Prison](https://oj.uz/problem/view/BOI21_prison){:target="_blank"}|2700|

Spoiler

• dfs
• dsu

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Worm Worries - sub 3 - 4](https://oj.uz/problem/view/BOI18_worm){:target="_blank"}|2700|

Spoiler

• [باینری سرچ](/Level1/binary_search){:target="_blank"}

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Taking The Middle](https://atcoder.jp/contests/agc053/tasks/agc053_b){:target="_blank"}|2700|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-atcoder: [Atcoder](https://atcoder.jp){:target="_blank"}| |[Too Many Constraints](https://codeforces.com/problemset/problem/1697/F){:target="_blank"}|2800|

Spoiler

• 2_sat

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Bracket Query](https://codeforces.com/gym/103931/problem/B){:target="_blank"}|2800|

Spoiler

• bellman

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[رشته‌ی خیلی بزرگ](https://quera.org/problemset/80649/){:target="_blank"}|2800|

Spoiler

• bellman
• aho

|:judge-quera: [Quera](https://quera.org){:target="_blank"}| |[AquaMoon and Permutations](https://codeforces.com/contest/1545/problem/C){:target="_blank"}|2800|

Spoiler

• dfs

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Shop](https://codeforces.com/problemset/problem/521/D){:target="_blank"}|2800|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Mashtali: a Space Oddysey](https://codeforces.com/problemset/problem/1610/F){:target="_blank"}|2900|

Spoiler

• euler_tour

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Subsequences Return](https://codeforces.com/problemset/problem/497/E){:target="_blank"}|2900|

Spoiler

• matrix

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Subsequence](https://codeforces.com/contest/1580/problem/D){:target="_blank"}|2900|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Meta Universe](https://codeforces.com/contest/475/problem/F){:target="_blank"}|2900|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}
• dsu

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[T-covering](https://oj.uz/problem/view/eJOI19_covering){:target="_blank"}|2900|

Spoiler

• dfs

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Upgrading Cities](https://codeforces.com/problemset/problem/1062/F){:target="_blank"}|2900|

Spoiler

• topol_sort

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Keep Xor Low](https://codeforces.com/problemset/problem/1616/H){:target="_blank"}|2900|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Candy Shop](https://codeforces.com/problemset/problem/183/E){:target="_blank"}|2900|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Duff in Mafia](https://codeforces.com/problemset/problem/587/D){:target="_blank"}|3000|

Spoiler

• 2_sat

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |

[تبعید](https://quera.org/problemset/18780/){:target="_blank"}

|3000|

Spoiler

• 2_sat

|:judge-quera: [المپیادی](https://codeforces.org){:target="_blank"}| |[Points and Segments](https://codeforces.com/contest/429/problem/E){:target="_blank"}|3000|

Spoiler

• euler_tour

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Little Pony and Elements of Harmony](https://codeforces.com/problemset/problem/453/D){:target="_blank"}|3000|

Spoiler

• matrix
• fwht

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Closest Point Pair](https://www.spoj.com/problems/CLOPPAIR/){:target="_blank"}|3000|

Spoiler

• [تقسیم و حل](/Level1/divide){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Jail](https://oj.uz/problem/submit/JOI22_jail){:target="_blank"}|3000|

Spoiler

• lca
• fake_vertex
• topol_sort

|:judge-ojuz: [Oj.uz](https://oj.uz){:target="_blank"}| |[Double Knapsack](https://codeforces.com/problemset/problem/618/F){:target="_blank"}|3000|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}
• [پریفیکس سام](/Level1/prefix_sum){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Ants](https://codeforces.com/problemset/problem/1007/D){:target="_blank"}|3100|

Spoiler

• 2_sat
• fake_vertex

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |

[غازززلند](https://quera.org/problemset/107493/){:target="_blank"}

|3300|

Spoiler

• random_algorithm
• adhoc

|:judge-quera: [المپیادی](https://codeforces.org){:target="_blank"}| |[Tourists](https://codeforces.com/problemset/problem/487/E){:target="_blank"}|3400|

Spoiler

• hld
• block_tree

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[I Might Be Wrong](https://codeforces.com/problemset/problem/1693/F){:target="_blank"}|3400|

Spoiler

• [Two Pointers](/Level1/two_pointers){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}| |[Outermost Maximums](https://codeforces.com/problemset/problem/1693/E){:target="_blank"}|3400|

Spoiler

• [الگوریتم های حریصانه](/Level1/greedy){:target="_blank"}

|:judge-codeforces: [Codeforces](https://codeforces.com/){:target="_blank"}|