#include <bits/stdc++.h> using namespace std; #define endl '\n' #define st first #define nd second #define pb push_back #define sz(x) (int)(x).size() #define all(x) (x).begin(), (x).end() #define ll long long ll mod=1000000007; int inf=1000000007; ll infl=1000000000000000007; int a[500007]; bool was[500007]; int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n,k; cin>>n>>k; for(int i=1;i<=n;i++) cin>>a[i]; int ile=0; ll ans=0; for(int i=1;i<=n;i++) { if(was[a[i]]||ile>=k) continue; was[a[i]]=1; ile++; ans+=(ll)(i-ile); } if(ile<k) cout<<-1; else cout<<ans; 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 | #include <bits/stdc++.h> using namespace std; #define endl '\n' #define st first #define nd second #define pb push_back #define sz(x) (int)(x).size() #define all(x) (x).begin(), (x).end() #define ll long long ll mod=1000000007; int inf=1000000007; ll infl=1000000000000000007; int a[500007]; bool was[500007]; int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n,k; cin>>n>>k; for(int i=1;i<=n;i++) cin>>a[i]; int ile=0; ll ans=0; for(int i=1;i<=n;i++) { if(was[a[i]]||ile>=k) continue; was[a[i]]=1; ile++; ans+=(ll)(i-ile); } if(ile<k) cout<<-1; else cout<<ans; return 0; } |