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2739 Candy Party (Hard Version) bitmasks constructive algorithms dp graphs greedy implementation math Statement B2 Codeforces Round 896 (Div. 1) {1868} PROGRAMMING 750.0 Codeforces Round 896 (Div. 1, Div. 2) Editorial
6039 Shuffling Songs bitmasks dp graphs implementation strings Statement G Codeforces Round 937 (Div. 4) {1950} PROGRAMMING Codeforces Round 937 (Div. 4) Editorial