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231C - To Add or Not to Add (Codeforces - Codeforces Round #143 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1199
2 implementation 1053
3 Codeforces Div. 2 - C Problems 459
4 Binary Search & Ternary Search 349
5 sortings 316
6 two pointers 128