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916 Tricky and Clever Password binary search constructive algorithms data structures greedy hashing strings Statement E Codeforces Beta Round 30 (Codeforces format) {30} PROGRAMMING Codeforces Beta Round #30. Tutorial for problem A 2700
2087 Beaver data structures dp greedy hashing strings two pointers Statement C Codeforces Beta Round 71 {79} PROGRAMMING Codeforces Beta Round #71 Editorial 1800
599 The Next Good String data structures greedy hashing strings Statement D Codeforces Round 124 (Div. 1) {196} PROGRAMMING Codeforces Round #124 — editorial 2600
593 And Yet Another Bracket Sequence data structures greedy hashing string suffix structures strings Statement F VK Cup 2015 - Round 1 {524} PROGRAMMING VK Cup Round 1 (+ online mirror) editorial 2700
6133 Erase and Extend (Hard Version) binary search data structures greedy hashing string suffix structures strings Statement E2 Codeforces Round 726 (Div. 2) {1537} PROGRAMMING 1750.0 Codeforces Round #726 (Div.2) Editorial
29230 Remove Two Letters data structures greedy hashing strings Statement D Codeforces Round 855 (Div. 3) {1800} PROGRAMMING Codeforces Round 855 (Div. 3) Editorial