#include <iostream> #include <vector> #include <string> using namespace std; int main() { cin.tie(0); ios_base::sync_with_stdio(0); int n, k; cin >> n >> k; vector <int> c(n + 1), v(n); long long res = 0; for (auto& x : v) cin >> x; int cnt = 0; for (int i = 0; i < n && cnt < k; i++) { if (!c[v[i]]) { c[v[i]]++; res += i; res -= cnt; cnt++; } } if (cnt < k) res = -1; cout << res << "\n"; }
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 | #include <iostream> #include <vector> #include <string> using namespace std; int main() { cin.tie(0); ios_base::sync_with_stdio(0); int n, k; cin >> n >> k; vector <int> c(n + 1), v(n); long long res = 0; for (auto& x : v) cin >> x; int cnt = 0; for (int i = 0; i < n && cnt < k; i++) { if (!c[v[i]]) { c[v[i]]++; res += i; res -= cnt; cnt++; } } if (cnt < k) res = -1; cout << res << "\n"; } |