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425A - Sereja and Swaps (Codeforces - Codeforces Round #243 (Div. 1) & Codeforces Round #243 (Div. 2)) categories

Category Problems Count
1 brute force 494
2 Codeforces Div. 2 - C Problems 460
3 sortings 316
4 ista = LGBT head 1