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19913 LLPS binary search bitmasks brute force greedy implementation strings Statement A Codeforces Round 127 (Div. 2) {202} PROGRAMMING 900
4970 K-beautiful Strings binary search brute force greedy implementation strings Statement C Codeforces Round 705 (Div. 2) {1493} PROGRAMMING 1750.0 Codeforces Round #705 (Div.2) Editorial
2291 Kevin and Binary String (Easy Version) binary search brute force data structures dp greedy implementation strings two pointers Statement F1 IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2) {2061} PROGRAMMING 2000.0 IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2) Editorial
12728 Palindromex binary search brute force constructive algorithms data structures greedy implementation two pointers Statement D Codeforces Round 1096 (Div. 3) {2227} PROGRAMMING Codeforces Round 1096 (Div. 3) — Editorial