func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k, i, x = 0, m, num;     cin >> n >> k;     map<int, int> mp;     int arr[1000000];     for (i = 0; (i < n) && (x < k); i++) {       cin >> num;       if (mp[num] == 0) {         arr[x] = num;         mp[num] = 1;         x++;       }     }     int j = 0;     for (m = i; m <= (n - 1); m++) {       cin >> num;       if (mp[num] == 1) {         continue;       } else if ((mp[num] == 0) && ((x - j) != k)) {         arr[x] = num;         mp[num] = 1;         x++;       } else {         mp[arr[j]] = 0;         j++;         arr[x] = num;         x++;         mp[num] = 1;       }     }     cout << x - j <<   n ;     for (m = x - 1; m >= j; m--) {       cout << arr[m] <<    ;     }   }   