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1269 Game of Pairs constructive algorithms dfs and similar interactive math number theory Statement D Codeforces Round 668 (Div. 1) {1404} PROGRAMMING 2250.0 Codeforces Round #668 Editorial
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
7493 Hidden Permutations dfs and similar interactive math Statement C Hello 2022 {1621} PROGRAMMING 1500.0
402 Isaac's Queries brute force constructive algorithms dfs and similar divide and conquer greedy interactive math probabilities Statement G Codeforces Round 1066 (Div. 1 + Div. 2) {2157} PROGRAMMING 3000.0 Codeforces Round 1066 (Div. 1 + Div. 2) Editorial