3/4/7/9/13/17/18 WA,2/8 TLE,咋办? :(

#include <iostream>
using namespace std;

double s, x, cnt, num=7;
int main()
{
    cin >> s >> x;
    double l=s-x, r=s+x;
    while (cnt >= l)
    {
        cnt += num;
        num *= 0.98;
    }
    if ((cnt+num) > r) cout << 'y';
    else cout << 'n';
    return 0;
}