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.
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1 /** 2 * Definition for a binary tree node. 3 * public class TreeNode { 4 * int val; 5 * TreeNode left; 6 * TreeNode right; 7 * TreeNode(int x) { val = x; } 8 * } 9 */ 10 public class Solution { 11 public int minDepth(TreeNode root) { 12 if(root == null) return 0; 13 if(root.left == null) return 1 + minDepth(root.right); 14 if(root.right == null) return 1 + minDepth(root.left); 15 return Math.min(minDepth(root.left),minDepth(root.right)) + 1; 16 } 17 }