/in/foo.cc: In function 'int main()':
/in/foo.cc:6:9: warning: unused variable 'm' [-Wunused-variable]
  int n, m, p,i;
         ^
/in/foo.cc:6:12: warning: unused variable 'p' [-Wunused-variable]
  int n, m, p,i;
            ^
/in/foo.cc:6:14: warning: unused variable 'i' [-Wunused-variable]
  int n, m, p,i;
              ^