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2763 You Are Given a WASD-string... brute force data structures dp greedy implementation math strings Statement C Educational Codeforces Round 70 (Rated for Div. 2) {1202} PROGRAMMING 68972 2100
3136 Promising String (hard version) data structures implementation math strings Statement F2 Codeforces Round 780 (Div. 3) {1660} PROGRAMMING Codeforces Round #780 (Div. 3) Editorial
3449 Fibonacci Strings brute force data structures greedy implementation math number theory Statement B Codeforces Round 814 (Div. 1) {1718} PROGRAMMING 1250.0 Codeforces Round #814 (Div. 1, Div. 2) Editorial
2105 Omsk Metro (hard version) data structures dfs and similar divide and conquer dp implementation math trees Statement F2 Codeforces Round 881 (Div. 3) {1843} PROGRAMMING Codeforces Round #881 (Div. 3) Editorial
4528 Non-Palindromic Substring data structures hashing implementation math strings Statement B Codeforces Round 934 (Div. 1) {1943} PROGRAMMING 1250.0 Codeforces Round #934 (Div1, Div2) Editorial
9709 Beauty of the mountains brute force data structures implementation math number theory Statement D Codeforces Round 955 (Div. 2, with prizes from NEAR!) {1982} PROGRAMMING 1750.0 130839