『洛谷 p1026』第k小数

#include <cstdio>
#include <algorithm>
#define MAXN 10000 + 1
using namespace std;
int N, k;
int a[MAXN];
int (int argc, char **argv)
{
   ios::sync_with_stdio(false);
    cin >> N >> k;
 for (register int i = 1; i <= N; ++i)
      cin >> a[i];
 sort(a + 1, a + N + 1);
  if (k == 1)
 {
        cout << a[1] << endl;
        return 0;
   }
    int kth = 1;
    for (register int i = 2; i <= N; ++i)
  {
        if (a[i] != a[i - 1]) kth++;
        if (kth == k)
       {
            cout << a[i] << endl;
            return 0;
       }
    }
    cout << "NO RESULT" << endl;
 return 0;
}