OJ Board

I'm getting WA.
Can anyone tell me what I'm doing wrong.
It gives the right answer for all test cases that were posted.
Thanks,



#include <iostream>
#include <cstdio>
#include <map>
#include <cmath>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);i++)

long double calc(int x,int y ...