LeetCode Longest Substring with At Least K Repeating Characters(递归)
问题：给出一个字符串s，要求求出最长的子串，每个字符出现至少k次
思路：
方法一，先统计每个字符出现的次数，然后分别从头和尾找出出现资料最小为k的位置，然后再此区间遍历，当出现小于k次时，在两个子区间内寻找最大子串。
方法二，先计算字符出现小于k的位置，然后再相邻位置依次找到满足条件的。可以作些优化，当相邻的长度小于当前找到的最大长度值时，可以剪枝处理
具体代码参考：
https://github.com/wuli2496/OJ/tree/master/LeetCode/Longest%20Substring%20with%20At%20Least%20K%20Repeating%20Characters
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