Title: 分割字符频率相等的最少子字符串(Minimum Substring Partition of Equal Character Frequency)

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Difficulty: Medium
Tags: 哈希表(Hash Table)、字符串(String)、动态规划(Dynamic Programming)、计数(Counting)
Link: https://leetcode.com/problems/minimum-substring-partition-of-equal-character-frequency
LinkCN: https://leetcode.cn/problems/minimum-substring-partition-of-equal-character-frequency