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196C - Paint Tree (Codeforces - Codeforces Round #124 (Div. 1) & Codeforces Round #124 (Div. 2)) categories

Category Problems Count
1 Codeforces Div. 2 - E Problems 438
2 sortings 316
3 Geometry 254
4 trees 202
5 divide and conquer 66