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/**

* Given a binary tree, find its minimum depth.

*

* <p>The minimum depth is the number of nodes along the shortest path from the root node down to

* the nearest leaf node.

*/

public class MinimumDepthofBinaryTree {

public int minDepth(TreeNode root) {

if (root == null) return 0;

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

else {

int leftDepth = root.left != null ? minDepth(root.left) : Integer.MAX_VALUE;

int rightDepth = root.right != null ? minDepth(root.right) : Integer.MAX_VALUE;

return Math.min(leftDepth, rightDepth) + 1;

}

}

}