# include<bits/stdc++.h>
using namespace std;
int main(){
        ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n, k;
	cin >> n >> k;
	int a[n];
	for(int i = 1; i <= n; i++) cin >> a[i];
	sort(a + 1, a + 1 + n);
	cout << a[k + 1];
	return 0;
}

这样做时间是1.20s!

然而时间限制是1.00s

可是却能AC,what???