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587C - Duff in the Army (Codeforces - Codeforces Round #326 (Div. 1) & Codeforces Round #326 (Div. 2)) categories

Category Problems Count
1 data structures 489
2 Codeforces Div. 2 - E Problems 439
3 trees 202
4 Heavy-Light Descomposition 36
5 LCA 16
6 Lowest Common Ancestor 14