/in/foo.cc: In function 'int main()':
/in/foo.cc:11:11: warning: unused variable 'i' [-Wunused-variable]
     int n,i,x,a0,a1,b0,b1,ans,j;
           ^
/in/foo.cc:11:31: warning: unused variable 'j' [-Wunused-variable]
     int n,i,x,a0,a1,b0,b1,ans,j;
                               ^