Codeforces 741D - Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
2016-12-07
题目地址
描述 给定一棵 n ( 1 ≤ n ≤ 5 ⋅ 1 0 5 ) n(1\le n\le 5 \cdot {10}^5) n ( 1 ≤ n ≤ 5 ⋅ 1 0 5 ) 的有根树，根结点为 1 1 ......
