力扣1208
https://leetcode-cn.com/problems/get-equal-substrings-within-budget/
力扣424
https://leetcode-cn.com/problems/longest-repeating-character-replacement/
滑动窗口题目,需要用数组或者map统计每个字母出现的次数
136-只出现一次的数字
https://leetcode-cn.com/problems/single-number/
137-只出现一次的数字II
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