蒟蒻求助

这里是代码

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O2")
#define max(a,b) (a>b?a:b)
#define min(a,b) (a<b?a:b)
typedef long long ll;

int n, ans;
bool vis[1005];
 
int main()
{
	ios::sync_with_stdio(false);
    cin.tie(0);
	cout.tie(0);
	cin >> n;
	for (int i = 1, t; i <= n; i++)
	{
		cin >> t;
		vis[t] = 1;
	}
	
	for (int i = 1; i <= 1000; i++)
	{
		if (vis[i] == 0) continue;
		else ans++;
	}
	
	cout << ans << endl;
	for (int i = 1; i <= 1000; i++)
	{
		if (vis[i] == 0) continue;
		else cout << i << ' ';
	}
	return 0;
}

为什么UKE啊啊啊啊dalao们QAQ