/in/foo.cc: In function 'int main()':
/in/foo.cc:8:28: error: 'x' was not declared in this scope
  for(int i=0;i<n;i++) cin>>x>>p;
                            ^
/in/foo.cc:8:31: error: 'p' was not declared in this scope
  for(int i=0;i<n;i++) cin>>x>>p;
                               ^
/in/foo.cc:9:7: error: 'm' was not declared in this scope
  cin>>m;
       ^