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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int MAXN = 2005;
  5. int a[MAXN];
  6. int dp[MAXN][MAXN];
  7.  
  8. int main() {
  9.     ios::sync_with_stdio(false);
  10.     cin.tie(nullptr);
  11.     int n;
  12.     cin >> n;
  13.     for (int i = 1; i <= n; i++) cin >> a[i];
  14.     for (int len = 2; len <= n; len++) {
  15.         for (int l = 1; l + len - 1 <= n; l++) {
  16.             int r = l + len - 1;
  17.             if (a[l] == a[r])
  18.                 dp[l][r] = dp[l + 1][r - 1];
  19.             else
  20.                 dp[l][r] = min(dp[l + 1][r], dp[l][r - 1]) + 1;
  21.         }
  22.     }
  23.  
  24.     cout << dp[1][n];
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/0DguOt
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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