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531 Simplified Nonogram bitmasks dp hashing meet-in-the-middle Statement F Codeforces Round 298 (Div. 2) {534} PROGRAMMING 2900
2306 Make Them Similar bitmasks brute force hashing meet-in-the-middle Statement F Educational Codeforces Round 76 (Rated for Div. 2) {1257} PROGRAMMING Educational Codeforces Round 76 Editorial 2400
873 Playoff Restoration bitmasks brute force hashing implementation meet-in-the-middle Statement E Educational Codeforces Round 113 (Rated for Div. 2) {1569} PROGRAMMING 94721
4742 Dasha and Nightmares bitmasks hashing meet-in-the-middle Statement F Codeforces Round 855 (Div. 3) {1800} PROGRAMMING Codeforces Round 855 (Div. 3) Editorial