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leet code

535 - Maximum Depth of Binary Tree

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/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    int rslt=0;
    int maxDepth(TreeNode* root) {
        dfs(root, 0);
        return rslt;
    }

    void dfs(TreeNode* root, int cnt)
    {
        printf("%d\n", cnt);
        if(!root)
        {
            if(cnt > rslt) rslt = cnt;
            return;
        }

        if(root->left) dfs(root->left, cnt+1);
        if(root->right) dfs(root->right, cnt+1);
        return;
    }
};