hdu1009 - 贪心

2017-07-14 18:18:31

• writer:pprp
• 介绍：hdu1009
• 题目介绍，详见hdu1009
• 代码如下

  #include <iostream>
  #include <algorithm>
  #include <cstdio>
  #include<iomanip>  
  
  
  using namespace std;
  
  const int maxn = 1010;
  
  class mouse
  {
  public:
      int j;
      int f;
      int divide;
  };
  
  bool cmp(mouse m1,mouse m2)
  {
      if(m1.divide > m2.divide)
          return true;
      else
          return false;
  }
  
  int main()
  {
      int m,n;
  
      mouse mou[maxn];
      while(cin >> m >> n &&  m != -1 && n != -1)
      {
          double lp = 0;
          for(int i = 0 ; i < n ; i++)
          {
              mou[i].f = 0;
              mou[i].j = 0;
              mou[i].divide = 0;
          }
  
          for(int i = 0 ; i < n ; i++)
          {
              cin >> mou[i].j>>mou[i].f;
              mou[i].divide = mou[i].j/mou[i].f;
          }
  
          sort(mou,mou+n,cmp);
  
          for(int i = 0 ; i <n ; i++)
          {
              if(m >= mou[i].f)
              {
                  m -= mou[i].f;
                  lp += mou[i].j;
  
              }
              else
              {
                  lp += mou[i].j*(m/(double)mou[i].f);
              }
          }
          printf("%.3f\n",lp);
      }                     
  
      return 0;
  }