Please find the mistake in this code

#1

/**

  • Definition for binary tree
  • struct TreeNode {
  • int val;

  • TreeNode *left;

  • TreeNode *right;

  • TreeNode(int x) : val(x), left(NULL), right(NULL) {}
  • };
    /
    #define ll long long
    vector v;
    vector<vector> ans;
    void rec(TreeNode     A)
    {
    if(!A)
    return;
    v.push_back(A->val);
    if(!A->right&&!A->left)
    ans.push_back(v);
    rec(A->left);
    rec(A->right);
    v.pop_back();
    }
    ll vi(vector x)
    {
    reverse(x.begin(), x.end());
    ll decimal = 1;
    ll total = 0;
    for (auto& it : x)
    {
    total += (it * decimal)%1003;
    decimal = 10;
    }
    return total;
    }
    int Solution::sumNumbers(TreeNode     A) {
    ans.clear();
    v.clear();
    rec(A);
    ll sum=0;
    for(int i=0;i<ans.size();i++)
    {
    sum+=vi(ans[i])%1003;
    }
    return sum%1003;
    }
    indent preformatted text by 4 spaces
#2

Write code properly describing what you have done in each step. otherwise cant help.
Or you can check this beautifully written code in java by me. Like share and Subscribe.

public class Solution {
void Helper(TreeNode A, ArrayList<Integer> sum_string, int sum)
{ 
    if(A==null)
    {
        return;
    }
    
    if(A.left==null && A.right==null)
    {   
        sum=((sum*10)%1003+A.val)%1003;
        sum_string.add(sum);
        return;
    }
    
    sum=((sum*10)%1003+A.val)%1003;
    
    Helper(A.left,sum_string,sum);
    Helper(A.right,sum_string,sum);
    
    sum=sum/10;
    
}
public int sumNumbers(TreeNode A) {
    
  
    ArrayList<Integer> sum_string=new ArrayList<>();
   
    int path=0;
    
    Helper(A,sum_string,path);
    
    int sum=0;
    
    for(int elem:sum_string)
    {
        sum=((sum%1003)+(elem%1003))%1003;
    }
   return sum%1003; 
}

}