func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string ans1, ans2;     string s1, s2, ss1, ss2;     int a, b;     cin >> s1 >> s2;     a = atoi(s1.c_str()) + atoi(s2.c_str());     stringstream ss;     ss << a;     ss >> ans1;     for (int i = 0; i < s1.length(); ++i) {       if (s1[i] !=  0 ) {         ss1 += s1[i];       }     }     for (int i = 0; i < ans1.length(); ++i) {       if (ans1[i] !=  0 ) {         ans2 += ans1[i];       }     }     for (int i = 0; i < s2.length(); ++i) {       if (s2[i] !=  0 ) {         ss2 += s2[i];       }     }     b = atoi(ss1.c_str()) + atoi(ss2.c_str());     stringstream sss;     sss << b;     sss >> ans1;     if (ans1 == ans2) {       cout <<  YES ;     } else       cout <<  NO ;     return 0;   }   