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21.[Count Square Submatrices with All Ones](https://github.com/AlgoStudyGroup/Leetcode/tree/master/May-LeetCoding-Challenge/21-Count-Square-Submatrices-With-All-Ones): DP
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22.[Sort Characters By Frequency](https://github.com/AlgoStudyGroup/Leetcode/tree/master/May-LeetCoding-Challenge/22-Sort-Characters-By-Frequency): Hash Table
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