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632F - Magic Matrix (Codeforces - Educational Codeforces Round 9) categories

Category Problems Count
1 brute force 494
2 Best Problem Setters 410
3 graphs 291
4 Codeforces Div. 1, D 209
5 trees 202
6 Codeforces Div. 2 - F Problems 119
7 divide and conquer 66