P1223 这一题第一个点WA了，求大佬帮看看

#include <bits/stdc++.h>
using namespace std;
i>>nt a[1007],b[1007];
int main()
{
	int n;
	cin >> n;
	for(int i = 1;i <= n;i++)
	{
		cin >> a[i];
		b[i] = a[i];
	}
	sort(a+1,a+n+1);
	for(int i = 1;i <= n;i++)
	{
		cout << a[i] << " ";
	}
	cout << endl;
	for(int i = 1;i <= n;i++)
	{
		for(int j = 1;j <= n;j++)
		{
			if(a[i] == b[j])
				cout << j <<" ";
		}
	}
	double time = 0;
	for(int i = 1;i <= n;i++)
	{
		time += a[i] *(n-i);
	}
	printf("\n%.2f",time/n);
 	return 0;
}