1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
#include <iostream>
#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cout.tie(0);
    int n, k;
    cin >> n >> k;
    vector<int> t(n);
    for (int i = 0; i < n; ++i) {
        cin >> t[i];
    }
    int wynik = 0;
    vector<bool> vis(n + 1);
    int checker = -1;
    bool done = false;

    for (int i = 0; i < n; ++i) {
        if (checker == -1) {
            if (!vis[t[i]])
                vis[t[i]] = true;
            else {
                checker = i;
                if (checker >= k) {
                    done = true;
                    break;
                }
            }
        } else if (!vis[t[i]]) {
            wynik += i - checker;
            vis[t[i]] = true;
            checker++;
            if (checker >= k) {
                done = true;
                break;
            }
        }
    }
    if (checker == -1)
        cout << 0;
    else if (done)
        cout << wynik;
    else
        cout << -1;
    return 0;
}