一道很水的贪心是re,帮我看看好嘛

http://paste.


#include<iostream>
#include<algorithm>
#include<vector>
#include<algorithm>
#include<iomanip>
#include<functional>
using namespace std;

int main(){
    while(1){
        vector<double> vector1,vector2,vector3;
        int food,room;
        double sum=0;
        cin>>food>>room;
        if(food==-1&&room==-1) break;
        for(int i=0;i<room;i++){
            double temp1,temp2;
            cin>>temp1>>temp2;
            vector1.push_back(temp1);
            vector2.push_back(temp2);
        double temp3= temp1/temp2;
        vector3.push_back(temp3);
        }
        while(food!=0){
        vector<double>::iterator p=max_element(vector3.begin(),vector3.end());
        int x=distance(vector3.begin(),p);
      //  cout<<x<<"*"<<endl<<*p<<endl;
        if(vector2[x]>=food) {
                sum += (food/vector2[x]*vector1[x]);
                cout<<fixed<<setprecision(3)<<sum<<endl;
                food=0;
        }
        else {
                food -=vector2[x];
                sum +=vector1[x];
                vector3[x]=0;
               // cout<<sum<<endl;
        }
    }
}