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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int l,x,r,n,k,a[200005],mp[200009];
  6. long long ans;
  7.  
  8. int main(){
  9.     cin>>n>>k;
  10.     for(int i=0;i<n;i++){
  11.         cin>>a[i];
  12.     }
  13.  
  14.     for(int r=0;r<n;r++){
  15.         mp[a[r]]++;
  16.         if(mp[a[r]]==1) x++;
  17.         while(x>k){
  18.             mp[a[l]]--;
  19.             if(mp[a[l]]==0) x--;
  20.             l++;
  21.         }
  22.         ans+=r-l+1;
  23.     }
  24.     cout<<ans<<endl;
  25. }
  26.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/JFbKsb
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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