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#include <iostream> #include <string> #include <cstring> #include <map> using namespace std; const int maxn = 505; int zuma[maxn]; int dp[maxn][maxn]; int rec(int i, int j) { if(i > j) { return 0; } if(i == j) { return 1; } if(dp[i][j] != -1) { return dp[i][j]; } int res = 2e9; res = min(res, rec(i + 1, j) + 1); if(zuma[i] == zuma[i + 1]) { res = min(res, rec(i + 2, j) + 1); } for(int k = i + 2; k <= j; k++) { if(zuma[i] == zuma[k]) { res = min(res, rec(i + 1, k - 1) + rec(k + 1, j)); } } return dp[i][j] = res; } int main() { ios_base::sync_with_stdio(false); int n; cin >> n; for(int i = 0; i < n; i++) { cin >> zuma[i]; } memset(dp, -1, sizeof dp); cout << rec(0, n - 1) << endl; return 0; }
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