foo.cc:7:1: error: 'queue' does not name a type
 queue<data>q;
 ^~~~~
foo.cc: In function 'int main()':
foo.cc:11:5: error: 'memset' was not declared in this scope
     memset(a,' ',sizeof(a));
     ^~~~~~
foo.cc:12:5: error: 'cin' was not declared in this scope
     cin>>m>>n;
     ^~~
foo.cc:12:5: note: suggested alternative: 'main'
     cin>>m>>n;
     ^~~
     main
foo.cc:14:9: error: 'getchar' was not declared in this scope
         getchar();
         ^~~~~~~
foo.cc:14:9: note: suggested alternative: 'char'
         getchar();
         ^~~~~~~
         char
foo.cc:15:32: error: 'scanf' was not declared in this scope
         for(int j=1; j<=m; j++)scanf("%c",&a[i][j]);
                                ^~~~~
foo.cc:19:16: error: 'q' was not declared in this scope
         while(!q.empty())q.pop();
                ^
foo.cc:22:9: error: 'q' was not declared in this scope
         q.push(data{x,y,0});
         ^
foo.cc:46:9: error: 'cout' was not declared in this scope
         cout<<ans1<<endl;
         ^~~~
foo.cc:46:21: error: 'endl' was not declared in this scope
         cout<<ans1<<endl;
                     ^~~~
foo.cc:46:21: note: suggested alternative: 'enum'
         cout<<ans1<<endl;
                     ^~~~
                     enum