/in/foo.cc: In function 'int main()':
/in/foo.cc:30:47: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
         scanf("%llf%llf%llf",&x[i],&y[i],&s[i]);
                                               ^
/in/foo.cc:30:47: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
/in/foo.cc:30:47: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
/in/foo.cc:43:24: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
     printf("%.2llf",ans);
                        ^