Bored Bakry

4000ms

262144K

Description:

Bakry got bored of solving problems related to xor, so he asked you to solve this problem for him.

You are given an array $$$a$$$ of $$$n$$$ integers $$$[a_1, a_2, \ldots, a_n]$$$.

Let's call a subarray $$$a_{l}, a_{l+1}, a_{l+2}, \ldots, a_r$$$ good if $$$a_l \, \& \, a_{l+1} \, \& \, a_{l+2} \, \ldots \, \& \, a_r > a_l \oplus a_{l+1} \oplus a_{l+2} \ldots \oplus a_r$$$, where $$$\oplus$$$ denotes the bitwise XOR operation and $$$\&$$$ denotes the bitwise AND operation.

Find the length of the longest good subarray of $$$a$$$, or determine that no such subarray exists.

Input:

The first line contains a single integer $$$n$$$ ($$$1 \le n \le 10^6$$$) — the length of the array.

The second line contains $$$n$$$ integers $$$a_1, a_2, \ldots, a_n$$$ ($$$1 \le a_i \le 10^6$$$) — elements of the array.

Output:

Print a single integer — the length of the longest good subarray. If there are no good subarrays, print $$$0$$$.

Sample Input:

2
5 6

Sample Output:

Sample Input:

3
2 4 3

Sample Output:

Sample Input:

6
8 1 3 3 1 2

Sample Output:

Note:

In the first case, the answer is $$$2$$$, as the whole array is good: $$$5 \& 6 = 4 > 5 \oplus 6 = 3$$$.

In the third case, the answer is $$$4$$$, and one of the longest good subarrays is $$$[a_2, a_3, a_4, a_5]$$$: $$$1\& 3 \& 3 \&1 = 1 > 1\oplus 3 \oplus 3\oplus 1 = 0$$$.

Informação

Provedor Codeforces

Código CF1592E