/in/foo.cc: In function 'int main()':
/in/foo.cc:5:16: warning: unused variable 'i' [-Wunused-variable]
  int n,m,q,ans,i,j,x;
                ^
/in/foo.cc:5:18: warning: unused variable 'j' [-Wunused-variable]
  int n,m,q,ans,i,j,x;
                  ^