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777E - Hanoi Factory (Codeforces - Codeforces Round #401 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1201
2 Greedy 598
3 brute force 493
4 data structures 488
5 Codeforces Div. 2 - E Problems 437
6 sortings 316
7 TowerOfHanoi 9