#include <bits/stdc++.h> #define DEBUG(x) cout << '>' << #x << ':' << x << endl; #define fi first #define se second #define ll long long #define ld long double #define pb push_back #define vi vector<int> #define MAXN 100001 using namespace std; int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n, k; cin >> n >> k; vector<bool> S(k, false); vector<int> V(k, -1); int a; int j = 0; for (int i = 0; i < n; i++) { cin >> a; if (!S[a]) { S[a] = true; V[j] = i; j++; } } ll res = 0; if (j < k) { res = -1; } else { for (int i = 0; i < k; i++) { res += V[i] - i; } } cout << res << endl; 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 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | #include <bits/stdc++.h> #define DEBUG(x) cout << '>' << #x << ':' << x << endl; #define fi first #define se second #define ll long long #define ld long double #define pb push_back #define vi vector<int> #define MAXN 100001 using namespace std; int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n, k; cin >> n >> k; vector<bool> S(k, false); vector<int> V(k, -1); int a; int j = 0; for (int i = 0; i < n; i++) { cin >> a; if (!S[a]) { S[a] = true; V[j] = i; j++; } } ll res = 0; if (j < k) { res = -1; } else { for (int i = 0; i < k; i++) { res += V[i] - i; } } cout << res << endl; return 0; } |