-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy path1022-SumOfRootToLeafBinaryNumbers.cs
46 lines (42 loc) · 1.28 KB
/
1022-SumOfRootToLeafBinaryNumbers.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
//-----------------------------------------------------------------------------
// Runtime: 92ms
// Memory Usage: 24.6 MB
// Link: https://leetcode.com/submissions/detail/331987349/
//-----------------------------------------------------------------------------
namespace LeetCode
{
/**
* Definition for a binary tree node.
* public class TreeNode {
* public int val;
* public TreeNode left;
* public TreeNode right;
* public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
public class _1022_SumOfRootToLeafBinaryNumbers
{
public int SumRootToLeaf(TreeNode root)
{
var sum = 0;
Helper(root, 0, ref sum);
return sum;
}
private void Helper(TreeNode node, int current, ref int sum)
{
if (node == null) return;
current = current * 2 + node.val;
if (node.left == null && node.right == null)
{
sum += current;
return;
}
Helper(node.left, current, ref sum);
Helper(node.right, current, ref sum);
}
}
}