Wrong Answer
/in/foo.cc: In function 'int main()':
/in/foo.cc:10:20: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
printf("%.2lf",res);
^
/in/foo.cc: In function 'int main()':
/in/foo.cc:10:20: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
printf("%.2lf",res);
^
