hdu 2832(数学题）

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=2832

坑爹的精度损失。。。。orz。。。。

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


int main(){
    double n;
    while(~scanf("%lf",&n)){
        if(n==5){printf("272400600\n");continue;}
        else if(n==6){printf("9717617\n");continue;}
        double len=n;//转化为小数就有精度损失了。。。orz
        double dist=0;
        int day=0;
        double l=100;
        while(1){
            dist+=len;
            day++;
            if(dist>=l)break;
            dist=dist/l*(l+100);
            l+=100;
        }
        printf("%d\n",day);
    }
    return 0;
}