sum-root-to-leaf-numbers (前序遍历)
class Solution {
public:
int sumNumbers(TreeNode *root) {
int sum = ;
if (root == NULL) return sum;
return pre(root, sum);
}
int pre(TreeNode *root, int sum)
{
if (root == NULL)return ;
sum = sum * + root->val;
if (root->left == NULL&&root->right == NULL){
return sum;
}
return pre(root->left, sum) + pre(root->right, sum);
}
};
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