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3973 Prime Permutation implementation number theory strings Statement A Codeforces Beta Round 92 (Div. 1 Only) {123} PROGRAMMING Codeforces Beta Round #92 - Analysis 1600
17378 Nearly Shortest Repeating Substring brute force implementation number theory strings Statement E Codeforces Round 937 (Div. 4) {1950} PROGRAMMING Codeforces Round 937 (Div. 4) Editorial
17321 GCD-sequence greedy implementation math math number theory number theory Statement D Codeforces Round 950 (Div. 3) {1980} PROGRAMMING 130135