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2141 Cooperative Game constructive algorithms interactive number theory Statement D Codeforces Round 545 (Div. 1) {1137} PROGRAMMING Codeforces Round #545 – Editorial 2500
959 Guess Divisors Count constructive algorithms interactive number theory Statement F Codeforces Round 643 (Div. 2) {1355} PROGRAMMING 3000.0 Codeforces Round #643 (Div. 2) Editorial 2600
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
152 Xor-quiz constructive algorithms dp interactive math number theory Statement H Codeforces Global Round 16 {1566} PROGRAMMING 3750.0 Codeforces Global Round 16 Editorial
4625 GCD Guess bitmasks chinese remainder theorem constructive algorithms interactive math number theory Statement D Codeforces Round 781 (Div. 2) {1665} PROGRAMMING 1500.0 Codeforces Round #781 (Div. 2) Editorial
6219 Tournament Countdown constructive algorithms fft greedy greedy interactive number theory probabilities Statement D Codeforces Round 812 (Div. 2) {1713} PROGRAMMING 2000.0 Codeforces Round #812 (Div. 2) Editorial 1800
11324 Hacking Numbers (Easy Version) bitmasks constructive algorithms interactive math number theory Statement C1 Codeforces Round 1025 (Div. 2) {2109} PROGRAMMING 1250.0 Codeforces Round 1025 (Div. 2) Editorial
8586 Hacking Numbers (Medium Version) constructive algorithms interactive math number theory Statement C2 Codeforces Round 1025 (Div. 2) {2109} PROGRAMMING 750.0 Codeforces Round 1025 (Div. 2) Editorial
3175 Hacking Numbers (Hard Version) constructive algorithms interactive math number theory Statement C3 Codeforces Round 1025 (Div. 2) {2109} PROGRAMMING 500.0 Codeforces Round 1025 (Div. 2) Editorial
297 Binary Strings are Simple? constructive algorithms dsu interactive number theory Statement E Codeforces Round 1089 (Div. 2) {2210} PROGRAMMING 2750.0 Codeforces Round 1089 (Div. 2) Editorial