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SumRootToLeafNumbers.java

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public class SumRootToLeafNumbers {

public int sumNumbers(TreeNode root) {

int[] res = new int[1];

helper(root, 0, res);

return res[0];

}

private void helper(TreeNode node, int sum, int[] res) {

if (node == null) {

return;

}

int n = sum * 10 + node.val;

if (node.left == null && node.right == null) {

res[0] += n;

} else {

helper(node.left, n, res);

helper(node.right, n, res);

}

}

}