func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s, t, sum;     cin >> s >> t;     string n = to_string(stoi(s) + stoi(t));     s.erase(remove(s.begin(), s.end(),  0 ), s.end());     t.erase(remove(t.begin(), t.end(),  0 ), t.end());     n.erase(remove(n.begin(), n.end(),  0 ), n.end());     if (stoi(s) + stoi(t) == stoi(n))       cout <<  YES  << endl;     else       cout <<  NO  << endl;   }   