129. Sum Root to Leaf Numbers | LEETCODE BINARY TREE | LEETCODE MEDIUM | CODE EXPLAINER

Code linK :

[shivamdhir]

awesome explanation sir, just had one doubt,
instead of doing sum = sum*10 + root->val,
I did sum = sum + root->val
and passed num*10 int the recursive call, i.e. sumOfNum(root->left, num*10, ans),
but was getting wrong answer,
can u please explain what am I doing wrong