[LeetCode] First Unique Character in a String 字符串第一个不同字符

Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples: s = "leetcode" return 0....

[LeetCode] Longest Repeating Character Replacement 最长重复字符置换

Given a string that consists of only uppercase English letters, you can replace any letter in the string with another letter at most k times...

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