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559B - Equivalent Strings (Codeforces - Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2)) categories

Category Problems Count
1 Codeforces Div. 2 - D Problems 443
2 sortings 316
3 strings 215
4 hashing 75
5 divide and conquer 66