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525 Letters and Question Marks bitmasks dp string suffix structures Statement G Educational Codeforces Round 84 (Rated for Div. 2) {1327} PROGRAMMING Educational Codeforces Round 84 Editorial 2900
1159 x-prime Substrings bitmasks dp greedy number theory string suffix structures strings Statement F Educational Codeforces Round 94 (Rated for Div. 2) {1400} PROGRAMMING 81942
632 Keyboard Design bitmasks data structures dp string suffix structures strings Statement F Educational Codeforces Round 136 (Rated for Div. 2) {1739} PROGRAMMING Educational Codeforces Round 136 Editorial