problema rucsacului greedy

#include<fstream>
#include<iostream>
using namespace std;
struct obiect
{   float g,c,e;
    int k;
};
obiect a[20];
int n,m,s[20],G=20;
float x[20];

void citire()
{   ifstream f("e:\\info\\greedy\\rucsac.txt");
    f>>n;
    for(int i=1;i<=n;i++)
    {   f>>a[i].k>>a[i].g>>a[i].c;
        a[i].e=a[i].c/a[i].g;}
        f.close();}

void afisare()
{   for(int i=1;i<=n;i++)
    {   cout<<a[i].k<<" "<<a[i].g<<" "<<a[i].c<<" "<<a[i].e;
    cout<<endl;}}

void sortare()
{   obiect aux;
    for(int i=1;i<n;i++)
        for(int j=i+1;j<=n;j++)
            if(a[i].e<a[j].e)
            {   aux=a[i];
                a[i]=a[j];
                a[j]=aux;}}

void greedy()
{   int Gr=G,j=0;
    for(int i=1;i<=n && Gr!=0;i++)
        if(Gr>a[i].g)
        {   j++;
            s[j]=i;
            x[j]=1;
            Gr=Gr-a[i].g;}
        else
        {   j++;
            s[j]=i;
            x[j]=Gr/a[i].g;
            Gr=0;}
        m=j;
        cout<<m;}

void afisareS()
{   for(int i=1;i<=m;i++)
        cout<<"obiectul nr "<<a[s[i]].k<<" in cantitatea "<<x[i]*a[s[i]].g<<endl;}

int main ()
{   citire();
    afisare();
    sortare();
    cout<<endl;
    afisare();
    greedy();
    cout<<endl;
    afisareS();}
5
1 5 10
2 4 20
3 4 10
4 8 10
5 10 22