codeforces 607B
题意:
题解:
#include <bits\stdc++.h>
using namespace std;
const int N = 501;
int a[N];
int dp[N][N];
int main() {
int n;
cin >> n;
for(int i = 1 ; i <= n ; i++){
cin >> a[i];
}
for(int i = 1 ; i <= n ; i++){
dp[i][i] = 1;
}
for(int len = 2 ; len <= n ; len++){
for(int l = 1, r = len ; r <= n ; l++, r++){
if(a[l] == a[r]){
dp[l][r] = (len == 2 ? 1 : dp[l+1][r-1]);
}
else{
dp[l][r] = 1 << 30;
}
for(int k = l ; k <= r ; k++){
dp[l][r] = min(dp[l][r], dp[l][k]+dp[k+1][r]);
}
}
}
cout << dp[1][n] << endl;
return 0;
}