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Tuesday 19 July 2022

[Solution] Almost Triple Deletions CodeForces Solution


D. Almost Triple Deletions
time limit per test
2 seconds
memory limit per test
256 megabytes
input
standard input
output
standard output

You are given an integer n and an array a1,a2,,an.

In one operation, you can choose an index i (1i<n) for which aiai+1 and delete both ai and ai+1 from the array. After deleting ai and ai+1, the remaining parts of the array are concatenated.

For example, if a=[1,4,3,3,6,2], then after performing an operation with i=2, the resulting array will be [1,3,6,2].

What is the maximum possible length of an array of equal elements obtainable from a by performing

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 several (perhaps none) of the aforementioned operations?

Input

Each test contains multiple test cases. The first line of input contains one integer t (1t1000) — the

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 number of test cases. The following lines contain the descriptions of the test cases.

The first line of each test case contains a single integer n (1n5000) — the length of array a.

The second line of each test case contains n integers a1,a2,,an (1ain) — the elements of array a.

It is guaranteed that the sum of n across all test cases does not exceed 10000.

Output

For each testcase, print a single integer, the maximum possible length of an array of equal elements obtainable from a by performing a sequence of operations.

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