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113B - Petr# (Codeforces - Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only)) categories

Category Problems Count
1 Dynamic Programming 1209
2 brute force 494
3 data structures 489
4 Codeforces Div. 2 - D Problems 443
5 strings 216
6 trees 202
7 hashing 76
8 Suffix Array/Tree 27