hdu acm 2187

#include "iostream"
#include "stdlib.h"
#include "string.h"

typedef struct{
 int p;
 int w;
}rice;

int cmp(const void *a,const void *b)
{
    rice *c=(rice *)a;
    rice *d=(rice *)b;
 return c->p-d->p;
}

int main()
{
 int n,m;
 int c;
 rice r[1005];

 scanf("%d",&c);
 while(c--)
 {
  scanf("%d%d",&n,&m);
  for(int i=0;i<m;i++)
  {
   scanf("%d%d",&r[i].p,&r[i].w);
  }

  qsort(r,m,sizeof(rice),cmp);

  int i=0;
  double sum=0;

  while(r[i].p*r[i].w<=n&&i<m)
  {
   sum+=(double)r[i].w;
   n=n-r[i].w*r[i].p;
   i++;
  }

  if(i<m&&n>0)
   sum+=(double)n/r[i].p;

  printf("%.2lf\n",sum);
 }

 return 0;
}

   

原文地址:https://www.cnblogs.com/Shirlies/p/2325035.html