Minimum Depth of Binary Tree

Minimum Depth of Binary Tree

问题：

Given a binary tree, find its minimum depth.

The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.

思路：

　　dfs

我的代码：

public class Solution {

    public int minDepth(TreeNode root) {

        if(root == null)    return 0;

        if(root.left == null && root.right == null) return 1;

        int left = Integer.MAX_VALUE;

        int right = Integer.MAX_VALUE;

        if(root.left != null)

            left = minDepth(root.left);

        if(root.right != null)

            right = minDepth(root.right);

        return Math.min(left, right) + 1;

    }

}

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