https://leetcode.com/problems/valid-palindrome https://leetcode.com/problems/reverse-linked-list https://leetcode.com/problems/string-compression https://leetcode.com/problems/longest-substring-without-repeating-characters https://leetcode.com/problems/valid-mountain-array/ https://leetcode.com/problems/remove-duplicates-from-sorted-array/ https://leetcode.com/problems/plus-one/ https://leetcode.com/problems/find-the-distance-value-between-two-arrays/ https://leetcode.com/problems/validate-ip-address/ https://leetcode.com/problems/valid-anagram https://leetcode.com/problems/word-pattern/ https://leetcode.com/problems/merge-intervals/

https://leetcode.com/problems/bulb-switcher/ https://leetcode.com/problems/two-sum/ https://leetcode.com/problems/string-to-integer-atoi/ https://leetcode.com/problems/zigzag-conversion/

https://leetcode.com/problems/similar-string-groups/ https://leetcode.com/problems/remove-element/

https://leetcode.com/problems/valid-number/ https://leetcode.com/problems/roman-to-integer/ https://leetcode.com/problems/checking-existence-of-edge-length-limited-paths/