[Codechef] ATM (HS08TEST)

The problem is totally straightforward. Only possible cause for wrong answer response is if x = y. In that case you should check if x+0.5 > y or not.

#include <stdio.h>

int main()
{
    int x;
    double y;
    while (scanf("%d %lf",&x,&y)==2)
    {
        if (!(((double)x+0.5)>y) && !(x%5))
            printf("%.2lf\n",y-(double)x-0.5);
        else
            printf("%.2lf\n",y);
    }
    return 0;
}