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1082 Enormous XOR bitmasks greedy strings two pointers Statement E Codeforces Round 705 (Div. 2) {1493} PROGRAMMING 2750.0 Codeforces Round #705 (Div.2) Editorial
1833 Stringforces binary search bitmasks data structures dp greedy strings two pointers Statement E Educational Codeforces Round 111 (Rated for Div. 2) {1550} PROGRAMMING Educational Codeforces Round 111 Editorial