int sumNumbers(TreeNode *root)

      {

          return dfs(root, );

      }

      int dfs(TreeNode *root, int sum)

      {

          if (root == nullptr)return ;

          if (root->left == nullptr && root->right == nullptr)

              return sum *  + root->val;

          return dfs(root->left, sum *  + root->val) + dfs(root->right, sum *  + root->val);

      }

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