class Solution {
int resSum = 0;
public int sumNumbers(TreeNode root) {
getSumRoot(root, 0);
return resSum;
}
void getSumRoot(TreeNode node, int sum){
if(node==null)
return;
sum = sum * 10 + node.val;
if(node.left==null && node.right==null){
resSum += sum;
return;
}
getSumRoot(node.left, sum);
getSumRoot(node.right, sum);
}
}
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