请大佬康康下面少了什么 (都改了5，6次了， 心态已崩 ) p.s.本人萌新

#include<bits/stdc++.h>
using namespace std;

int main(){
	double a,b,c,d,e,f;
	cin>>a>>b;
	c=0;d=0;e=7;f=a-b;
	while(1) {
		f=f-e;
		if(a==1&&b>=7) {
			cout<<"y";
			break;
		}
		if(f<=0) {
			if(b+f-e*0.98<0&&b+f-e*0.98<0-b){
				cout<<"n";
				break;
			}
			if(b+f-e*0.98<0) {
				cout<<"n";
				break;
			}
			if(b+f-e*0.98>=0) {
				cout<<"y";
				break;
			}
		}
		e=e*0.98;
	}
}