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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5. #define el printf("\n");
  6. #define pb push_back
  7.  
  8. int n;
  9. int a[200001],dp[100001];
  10. map<int,vector<int>> id;
  11.  
  12. int main() {
  13.     cin >> n;
  14.     for(int i=1;i<=n;i++) {
  15.         cin >> a[i];
  16.         id[a[i]].pb(i);
  17.     }
  18.     // dp[i] là số phần tử bị xóa đi nhiều nhất khi tính tới i
  19.     dp[0] = 0;
  20.     for(int i=1;i<=n;i++) {
  21.         dp[i] = dp[i-1];
  22.         for(int j=0;id[a[i]][j]<i;j++) {
  23.             dp[i] = max(dp[i],i-id[a[i]][j]+1+dp[id[a[i]][j]-1]);
  24.         }
  25.     }
  26.     cout << n-dp[n];
  27.     return 0;
  28. }
Success #stdin #stdout 0s 5268KB
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https://ideone.com/dHn9Xi
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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