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531 Half-decay tree data structures divide and conquer dp math probabilities Statement D Codeforces Beta Round 62 {68} PROGRAMMING 2400
2617 Gosha is hunting brute force data structures dp flows math probabilities sortings Statement E Codeforces Round 381 (Div. 1) {739} PROGRAMMING 48582 2900
4492 Beautiful Mirrors data structures dp math probabilities Statement E Codeforces Round 604 (Div. 2) {1265} PROGRAMMING Codeforces Round #604 Editorial 2100