/in/foo.cc: In function 'int main()':
/in/foo.cc:6:8: warning: unused variable 'l' [-Wunused-variable]
  int n,l,r,i;
        ^
/in/foo.cc:6:10: warning: unused variable 'r' [-Wunused-variable]
  int n,l,r,i;
          ^
/in/foo.cc:8:6: warning: unused variable 's' [-Wunused-variable]
  int s[n],s2[100000];
      ^