/in/foo.cc: In function 'int read()':
/in/foo.cc:20:5: error: 'rep' was not declared in this scope
     rep w * e;
     ^~~
/in/foo.cc:21:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:41:33: error: expected primary-expression before ';' token
         ans = (ans + x[i][k]) % ;
                                 ^