Leetcode 1519: Number of Nodes in the Sub-Tree With the Same Label

You are given a tree (i.e., a connected, undirected graph that has no cycles) consisting of n nodes numbered from 0 to n - 1 and exactly n - 1 edges. The root of the tree is the node 0, and each node of the tree has a label which is a lower-case character given in the string labels (i.e., The node with the number i has the label labels[i]). The edges array is given on the form edges[i] = [ai, bi], which means there is an edge between nodes ai and bi in the tree. Return an array of size n where ans[i] is the number of nodes in the subtree of the ith node, which have the same label as the node i. A subtree of a tree T is the tree consisting of a node in T and all of its descendant nodes.


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