Update README.md

README.md

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-# Strings-1
+# Strings-1
+
+## Problem1 
+Custome Sort String (https://leetcode.com/problems/custom-sort-string/)
+
+S and T are strings composed of lowercase letters. In S, no letter occurs more than once.
+
+S was sorted in some custom order previously. We want to permute the characters of T so that they match the order that S was sorted. More specifically, if x occurs before y in S, then x should occur before y in the returned string.
+
+Return any permutation of T (as a string) that satisfies this property.
+
+Example :
+Input: 
+S = "cba"
+T = "abcd"
+Output: "cbad"
+Explanation: 
+"a", "b", "c" appear in S, so the order of "a", "b", "c" should be "c", "b", and "a". 
+Since "d" does not appear in S, it can be at any position in T. "dcba", "cdba", "cbda" are also valid outputs.
+
+
+Note:
+
+S has length at most 26, and no character is repeated in S.
+T has length at most 200.
+S and T consist of lowercase letters only.
+
+## Problem2 
+
+Longest Substring Without Repeating Characters(https://leetcode.com/problems/longest-substring-without-repeating-characters/)
+
+Given a string, find the length of the longest substring without repeating characters.
+
+Example 1:
+
+Input: "abcabcbb"
+Output: 3 
+Explanation: The answer is "abc", with the length of 3. 
+Example 2:
+
+Input: "bbbbb"
+Output: 1
+Explanation: The answer is "b", with the length of 1.
+Example 3:
+
+Input: "pwwkew"
+Output: 3
+Explanation: The answer is "wke", with the length of 3. 
+             Note that the answer must be a substring, "pwke" is a subsequence and not a substring.