package leetcode

import (
	"github.com/halfrost/LeetCode-Go/structures"
)

// TreeNode define
type TreeNode = structures.TreeNode

/**
 * Definition for a binary tree node.
 * type TreeNode struct {
 *     Val int
 *     Left *TreeNode
 *     Right *TreeNode
 * }
 */

func minDepth(root *TreeNode) int {
	if root == nil {
		return 0
	}
	if root.Left == nil {
		return minDepth(root.Right) + 1
	}
	if root.Right == nil {
		return minDepth(root.Left) + 1
	}
	return min(minDepth(root.Left), minDepth(root.Right)) + 1
}

func min(a int, b int) int {
	if a > b {
		return b
	}
	return a
}