Sum Root to Leaf Numbers LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the Sum Root to Leaf Numbers in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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About LeetCode

LeetCode is one of the most well-known online judge platforms to help you enhance your skills, expand your knowledge and prepare for technical interviews. 

LeetCode is for software engineers who are looking to practice technical questions and advance their skills. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.

LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either EasyMedium, or Hard.

LeetCode problems focus on algorithms and data structures. Here is some topic you can find problems on LeetCode:

  • Mathematics/Basic Logical Based Questions
  • Arrays
  • Strings
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  • Stack & Queue
  • Trees & Graphs
  • Greedy Algorithms
  • Breadth-First Search
  • Depth-First Search
  • Sorting & Searching
  • BST (Binary Search Tree)
  • Database
  • Linked List
  • Recursion, etc.

Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.

Link for the ProblemSum Root to Leaf Numbers– LeetCode Problem

Sum Root to Leaf Numbers– LeetCode Problem


You are given the root of a binary tree containing digits from 0 to 9 only.

Each root-to-leaf path in the tree represents a number.

  • For example, the root-to-leaf path 1 -> 2 -> 3 represents the number 123.

Return the total sum of all root-to-leaf numbers. Test cases are generated so that the answer will fit in a 32-bit integer.

leaf node is a node with no children.

Example 1:

Input: root = [1,2,3]
Output: 25
The root-to-leaf path 1->2 represents the number 12.
The root-to-leaf path 1->3 represents the number 13.
Therefore, sum = 12 + 13 = 25.

Example 2:

Input: root = [4,9,0,5,1]
Output: 1026
The root-to-leaf path 4->9->5 represents the number 495.
The root-to-leaf path 4->9->1 represents the number 491.
The root-to-leaf path 4->0 represents the number 40.
Therefore, sum = 495 + 491 + 40 = 1026.


  • The number of nodes in the tree is in the range [1, 1000].
  • 0 <= Node.val <= 9
  • The depth of the tree will not exceed 10.
Sum Root to Leaf Numbers– LeetCode Solutions
Sum Root to Leaf Numbers Solution in C++:
class Solution {
  int sumNumbers(TreeNode* root) {
    int ans = 0;

    dfs(root, 0, ans);

    return ans;

  void dfs(TreeNode* root, int path, int& ans) {
    if (!root)
    if (!root->left && !root->right) {
      ans += path * 10 + root->val;

    dfs(root->left, path * 10 + root->val, ans);
    dfs(root->right, path * 10 + root->val, ans);
Sum Root to Leaf Numbers Solution in Java:
class Solution {
  public int sumNumbers(TreeNode root) {
    dfs(root, 0);

    return ans;

  private int ans = 0;

  private void dfs(TreeNode root, int path) {
    if (root == null)
    if (root.left == null && root.right == null) {
      ans += path * 10 + root.val;

    dfs(root.left, path * 10 + root.val);
    dfs(root.right, path * 10 + root.val);
Sum Root to Leaf Numbers Solution in Python:
class Solution:
  def sumNumbers(self, root: Optional[TreeNode]) -> int:
    self.ans = 0

    def dfs(root: Optional[TreeNode], path: int) -> None:
      if not root:
      if not root.left and not root.right:
        self.ans += path * 10 + root.val

      dfs(root.left, path * 10 + root.val)
      dfs(root.right, path * 10 + root.val)

    dfs(root, 0)

    return self.ans

33 thoughts on “Sum Root to Leaf Numbers LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]”

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