RT，为什么本地运行过了，提交上去却CE了。

code

#include<bits/stdc++.h>
using namespace std;
int n, ans, a[262145], f[262145][262145], l;
int dfs(int l, int r){
	if(f[l][r] != -1)
		return f[l][r];
	if(l == r)
		return f[l][r] = a[l];
	int t = 0;
	for(int i = l; i < r; ++i){
		int n1 = dfs(l, i), n2 = dfs(i + 1, r);
		if(n1 && n2 && n1 == n2)
			t = max(t, n1 + 1);
	}
	return f[l][r] = t;
}
int main(){
	cin >> n;
	for(int i = 1; i <= n; ++i)
		for(int j = 1; j <= n; ++j)
			f[i][j] = -1;
	for(int i = 1; i <= n; ++i)
		cin >> a[i];
	l = dfs(1, n);
	for(int i = 1; i <= n; ++i)
		for(int j = 1; j <= n; ++j)
			ans = max(f[i][j], ans);
	cout << ans;
	return 0;
}