hdu 1302(简单模拟题）

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;

int main(){
double h,u,d,f;
while(~scanf("%lf",&h)&&h){
scanf("%lf%lf%lf",&u,&d,&f);
int day=0;
bool flag=true;
double dist=0,s=u*f/100;
while(1){
day++;
dist+=u;
if(dist>h)break;
dist-=d;
if(dist<0){flag=false;break;};
u-=s;
if(u<0)u=0;
}
if(flag){
printf("success on day %d\n",day);
}else
printf("failure on day %d\n",day);
}
return 0;
}