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592 Hidden Single (Version 2) divide and conquer interactive math probabilities Statement E2 Codeforces Round 1053 (Div. 1) {2150} PROGRAMMING 1750.0 Editorial of Codeforces Round 1053 (Div. 1, Div. 2)
1012 Hidden Single (Version 1) divide and conquer interactive math probabilities sortings Statement E1 Codeforces Round 1053 (Div. 1) {2150} PROGRAMMING 2000.0 Editorial of Codeforces Round 1053 (Div. 1, Div. 2)
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