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1635 Decypher the String bitmasks chinese remainder theorem constructive algorithms interactive math Statement E Educational Codeforces Round 60 (Rated for Div. 2) {1117} PROGRAMMING 65365 2200
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
92 Game of Scientists (Version 2) brute force chinese remainder theorem interactive math Statement E2 Codeforces Round 1069 (Div. 1) {2174} PROGRAMMING 1750.0 Codeforces Round 1069 Editorial
126 Game of Scientists (Version 1) chinese remainder theorem interactive math Statement E1 Codeforces Round 1069 (Div. 1) {2174} PROGRAMMING 1750.0 Codeforces Round 1069 Editorial