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7445 Leha and Function combinatorics greedy math number theory sortings Statement A Codeforces Round 429 (Div. 1) {840} PROGRAMMING Editorial 1300
5523 Asterism (Easy Version) brute force combinatorics implementation math number theory sortings Statement E1 Codeforces Round 654 (Div. 2) {1371} PROGRAMMING 1500.0 Codeforces Round #654 (Div. 2) Editorial
1897 Three Chairs bitmasks brute force combinatorics data structures number theory sortings Statement F Codeforces Round 846 (Div. 2) {1780} PROGRAMMING 2000.0 111841
2168 Hyperregular Bracket Strings combinatorics hashing number theory sortings two pointers Statement C Codeforces Round 875 (Div. 1) {1830} PROGRAMMING 1750.0 Codeforces Round #875 (Div.1 + Div. 2) Editorial
10009 Effects of Anti Pimples combinatorics number theory sortings Statement B Codeforces Round 902 (Div. 1, based on COMPFEST 15 - Final Round) {1876} PROGRAMMING 1000.0 Codeforces Round #902 (Div. 1, Div. 2, based on COMPFEST 15 — Final Round) Editorial
4030 Counting Rhyme brute force combinatorics dp math number theory sortings Statement D Codeforces Round 904 (Div. 2) {1884} PROGRAMMING 2500.0 Codeforces Round #904 (Div. 2) Editorial