HDU 1302——The Snail

這個題目也不是很復雜。一只蝸牛，白天上升一些，晚上下滑一些，每天會因為沒有力氣而比上一天少爬，求這個蝸牛幾天滑到底或者幾天滑到頂。簡單模擬即可，如果用數學反而麻煩。另外當這個蝸牛上升比下降還快的時候，其實就已經不行了=  =#

[cpp]
#include <iostream>  
#include <string>  
using namespace std; 
int main() 
{ 
    double high,up,down,factor; 
    while(cin>>high>>up>>down>>factor) 
    { 
        bool succ=0,fail=0; 
        int needday=1; 
        double nowpos=0; 
        double rate=up*(factor/100.0); 
        if(high==0) 
            break; 
        while(nowpos<=high && nowpos>=0) 
        { 
            if(up>0) 
                nowpos+=up; 
            if(nowpos>high) 
            { 
                succ=1; 
                break; 
            } 
            nowpos-=down; 
            up-=rate; 
            if(nowpos<0) 
            { 
                fail=1; 
                break; 
            } 
            needday++; 
        } 
        if(fail==1) 
        { 
            cout<<"failure on day "<<needday<<endl; 
        } 
        else if(succ==1) 
        { 
            cout<<"success on day "<<needday<<endl; 
        } 
         
    } 
     
     
     
    return 0; 
} 

#include <iostream>
#include <string>
using namespace std;
int main()
{
 double high,up,down,factor;
 while(cin>>high>>up>>down>>factor)
 {
  bool succ=0,fail=0;
  int needday=1;
  double nowpos=0;
  double rate=up*(factor/100.0);
  if(high==0)
   break;
  while(nowpos<=high && nowpos>=0)
  {
   if(up>0)
    nowpos+=up;
   if(nowpos>high)
   {
    succ=1;
    break;
   }
   nowpos-=down;
   up-=rate;
   if(nowpos<0)
   {
    fail=1;
    break;
   }
   needday++;
  }
  if(fail==1)
  {
   cout<<"failure on day "<<needday<<endl;
  }
  else if(succ==1)
  {
   cout<<"success on day "<<needday<<endl;
  }
  
 }
 
 
 
 return 0;
}