#include<iostream> #include<set> using namespace std; int main() { int n, k, c = 0, t = 0, b; set<int> bb; cin >> n >> k; for (int i = 0; i < n; i++) { cin >> b; if (bb.count(b) == 0) { bb.insert(b); t += i - c; c++; } } cout << (c >= k ? t : -1); return 0; }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #include<iostream> #include<set> using namespace std; int main() { int n, k, c = 0, t = 0, b; set<int> bb; cin >> n >> k; for (int i = 0; i < n; i++) { cin >> b; if (bb.count(b) == 0) { bb.insert(b); t += i - c; c++; } } cout << (c >= k ? t : -1); return 0; } |