559. N 叉树的最大深度

题目链接：559. N 叉树的最大深度

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全代码：

/*
// Definition for a Node.
class Node {
public:
    int val;
    vector children;

    Node() {}

    Node(int _val) {
        val = _val;
    }

    Node(int _val, vector _children) {
        val = _val;
        children = _children;
    }
};
*/

class Solution {
public:
    int maxDepth(Node* root) {
        if (root == 0) return 0;
        int depth = 0;
        for (int i = 0; i < root->children.size(); i++) {
            depth = max (depth, maxDepth(root->children[i]));
        }
        return depth + 1;
    }
};