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15662 Lucky Numbers (easy) binary search bitmasks brute force Statement B Codeforces Beta Round 77 (Div. 2 Only) {96} PROGRAMMING Codeforces Beta Round #77 (Div. 2 Only) Question A - D 1400
7478 The Number Of Good Substrings binary search bitmasks brute force Statement C Educational Codeforces Round 72 (Rated for Div. 2) {1217} PROGRAMMING Educational Codeforces Round 72 Editorial 1600