Modern Art 3

#include <bits/stdc++.h>

using namespace std;

const int N = 300 + 9;

int rangeDP[N][N], A[N];

int main () {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> A[i];
    for (int len = 2; len <= n; len++) {
        for (int i = 1; i + len - 1 <= n; i++) {
            int j = i + len - 1;
            if (A[i] == A[j])
                rangeDP[i][j] = 1 + rangeDP[i + 1][j - 1];
            for (int k = i + 1; k < j; k++)
                rangeDP[i][j] = max (rangeDP[i][j], rangeDP[i][k] + rangeDP[k][j]);
        }
    }
    cout << n - rangeDP[1][n] << "\n";
    return 0;
}