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#include
#include
#include
#include
#include
using namespace std;
struct soft_drink{
double mi;
double wi;
double per;
}drink[1000];
bool cmp(soft_drink a, soft_drink b){
return a.per > b.per;
}
int main(){
int x,n;
while(cin>>x>>n){
if(x==-1 || n==-1) break;
for(int i=0; i cin>>drink[i].mi>>drink[i].wi;
drink[i].per = drink[i].mi / drink[i].wi; //每块钱能买多少毫升
}
sort(drink,drink+n,cmp); //从性价比由大到小排序
int i=0;
double sum...
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