func_code_string: #include <bits/stdc++.h>   using namespace std;   char c;   int s = 0, k = 0, n = 0, x, f = 0;   ;   int main() {     while (cin.get(c)) {       if (c ==   n ) break;       switch (s) {         case 0: {           if (c >=  a  && c <=  z  || c >=  A  && c <=  Z  || c ==  _  ||               c >=  0  && c <=  9 ) {             s = 1;             k++;           } else {             cout <<  NO ;             return 0;           }           break;         }         case 1: {           if ((c >=  a  && c <=  z  || c >=  A  && c <=  Z  || c ==  _  ||                c >=  0  && c <=  9 ) &&               k < 16)             k++;           else if (c ==  @ ) {             s = 2;             k = 0;             f = 1;           } else {             cout <<  NO ;             return 0;           }           break;         }         case 2: {           if ((c >=  a  && c <=  z  || c >=  A  && c <=  Z  || c ==  _  ||                c >=  0  && c <=  9 ) &&               k < 16 && n < 32) {             k++;             n++;             f = 0;           } else if (c ==  .  && f == 0) {             k = 0;             n++;             f = 1;           } else if (c ==  /  && f == 0) {             k = 0;             f = 1;             s = 3;           } else {             cout <<  NO ;             return 0;           }           break;         }         case 3: {           if (c >=  a  && c <=  z  || c >=  A  && c <=  Z  || c ==  _  ||               c >=  0  && c <=  9 ) {             k++;             f = 0;           } else if (c ==  /  && f == 0) {             k = 0;             f = 1;           } else {             cout <<  NO ;             return 0;           }           break;         }       }     }     if (f == 1)       cout <<  NO ;     else       cout <<  YES ;   }   