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1956 Ehab and the Big Finale constructive algorithms divide and conquer graphs implementation interactive trees Statement F Codeforces Round 563 (Div. 2) {1174} PROGRAMMING Codeforces round #563 editorial 2300
3593 Sum Graph constructive algorithms graphs implementation interactive math shortest paths trees Statement B Codeforces Round 865 (Div. 1) {1815} PROGRAMMING 1250.0 Editorial of Codeforces Round #865 2000
1565 Interactive Game with Coloring brute force constructive algorithms graphs implementation interactive math trees Statement E Educational Codeforces Round 155 (Rated for Div. 2) {1879} PROGRAMMING 120773 2400
7121 Object Identification graphs implementation interactive Statement A Codeforces Round 1004 (Div. 1) {2066} PROGRAMMING 750.0 139415
104 Inter Active (Hard Version) binary search bitmasks constructive algorithms graphs implementation interactive math probabilities Statement G2 Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) {2127} PROGRAMMING 2750.0 Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial