func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string x, y;     cin >> x >> y;     int sum = atoi(x.c_str()) + atoi(y.c_str());     int p = 0, now = 1;     for (; sum; sum /= 10) {       if (sum % 10 != 0) {         p += (sum % 10) * now;         now *= 10;       }     }     x.erase(remove(x.begin(), x.end(),  0 ), x.end());     y.erase(remove(y.begin(), y.end(),  0 ), y.end());     int X = atoi(x.c_str()), Y = atoi(y.c_str());     if (X + Y == p)       cout <<  YES  << endl;     else       cout <<  NO  << endl;     return 0;   }   