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4C - Registration System (Codeforces - Codeforces Beta Round #4 (Div. 2 Only)) categories

Category Problems Count
1 implementation 1054
2 data structures 489
3 Codeforces Div. 2 - C Problems 460
4 Codeforces Div. 2 - B Problems 457
5 sortings 316
6 hashing 76