我好困惑啊 下面是我写的代码：

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

struct people {
	int number;
	int time;
	int wating;
	bool operator < (const people& other) const {
		return time < other.time;
	}
};

struct people p[1000];

int main()
{
	int n;
	cin >> n;
	
	for (int i = 0; i < n; i++)
	{
		p[i].number = i + 1;
		cin >> p[i].time;
	}

	sort(p, p + n);
	
	for (int i = 0; i < n; i++)
	{
		cout << p[i].number << ' ';
	}
	cout << endl;

	int sum = 0;
	for (int i = 0; i < n; i++)
	{
		p[i].wating = 0;
		for (int j = i - 1; j >= 0; j--)
		{
			p[i].wating += p[j].time;
		}
	}

	for (int i = 0; i < n; i++)
		sum += p[i].wating;
	
	double avg = (double)sum / n;
	cout << setiosflags(ios::fixed) << setprecision(2) << avg << endl;
	return 0;
}

这个代码是未通过的，有两个错，下面是gpt帮我修改的代码：

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

struct person {
    int number;
    int time;
};

bool compareTime(const person& a, const person& b) {
    return a.time < b.time;
}

int main() {
    int n;
    cin >> n;

    person p[1000];
    for (int i = 0; i < n; i++) {
        p[i].number = i + 1;
        cin >> p[i].time;
    }

    sort(p, p + n, compareTime);

    for (int i = 0; i < n; i++) {
        cout << p[i].number << ' ';
    }
    cout << endl;

    double sum = 0.0;
    double waitingTime = 0.0;
    for (int i = 0; i < n; i++) {
        sum += waitingTime;
        waitingTime += p[i].time;
    }

    double avg = sum / n;
    cout << setiosflags(ios::fixed) << setprecision(2) << avg << endl;

    return 0;
}

这个代码是可以通过的 为什么这两个代码结果不一样啊，离谱