杭电1009 FatMouse' Trade
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/********************************
* 日期:2011-2-7
* 作者:SJF
* 题号:杭电1009
* 题目:FatMouse' Trade
* 结果:AC
********************************/
#include <stdio.h>
#include <stdlib.h>
/*int cmp(const void* a,const void* b)
{
return *(int*)a-*(int*)b;
}*/
int main()
{
int M,N;
while(scanf("%d%d",&M,&N)!=EOF)
{
int i,j,J[1000],F[1000],temp1;
double ratio[1000],JavaBeans=0,temp;
if((M==-1)&&(N==-1))
{
return 0;
}
for(i=0;i<N;i++)
{
scanf("%d%d",&J[i],&F[i]);
ratio[i]=(J[i]*1.0)/F[i];
}
for(i=0;i<N;i++)
{
for(j=0;j<N-i-1;j++)
{
if(ratio[j]<ratio[j+1])
{
temp=ratio[j];
ratio[j]=ratio[j+1];
ratio[j+1]=temp;
temp1=F[j];
F[j]=F[j+1];
F[j+1]=temp1;
temp1=J[j];
J[j]=J[j+1];
J[j+1]=temp1;
}
}
}
for(i=0;i<N;i++)
{
if(M>=F[i])
{
JavaBeans=J[i]+JavaBeans;
M=M-F[i];
}
else
{
JavaBeans=JavaBeans+ratio[i]*M;
break;
}
}
printf("%.3lf\n",JavaBeans);
}
return 0;
}
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