P1923求助

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

int a[300010];

int main()
{
    int n, k;
    cin >> n >> k;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    sort(a+1,a+n+1);
    
    cout << a[k] << endl;
    return 0;
}



怎么错了