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457 Enchanted Matrix bitmasks interactive number theory Statement F Codeforces Round 705 (Div. 2) {1493} PROGRAMMING 3250.0 Codeforces Round #705 (Div.2) Editorial
4087 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