程序存储问题

#include "iostream"#include "fstream"#include "queue"using namespace std;/*最短程序优先 */double a[50];//返回最多能存储的程序个数double greedy(int n, int len){    sort(a, a+n);  //按程序长度排序    int i = 0;    int sum = 0;    while(sum<=len && i<len)        sum += a[i++];    i--;    return i;}int main(){    ifstream fin("程序存储.txt");    int n;    cout << "输入程序个数：";    fin >> n; cout << n;    int len;    cout << "\n输入磁带长度：";    fin >> len; cout << len;    cout << "\n输入各程序长度:\n";    int i;    for(i=0; i<n; i++)    {        fin >> a[i];        cout << a[i] << " ";    }    cout << "\n最多可存储的程序个数为：" << greedy(n, len);    cout << endl;    fin.close();    return 0;}