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193 Strange device binary search interactive math trees Statement E Codeforces Round 559 (Div. 1) {1158} PROGRAMMING 66993 3300
2551 Hemose in ICPC ? binary search dfs and similar divide and conquer interactive math number theory trees Statement D Codeforces Round 746 (Div. 2) {1592} PROGRAMMING 2000.0 95583