Unequal Array
Description
You are given an array $a$ of length $n$. We define the equality of the array as the number of indices $1 \le i \le n - 1$ such that $a_i = a_{i + 1}$. We are allowed to do the following operation:
- Select two integers $i$ and $x$ such that $1 \le i \le n - 1$ and $1 \le x \le 10^9$. Then, set $a_i$ and $a_{i + 1}$ to be equal to $x$.
Find the minimum number of operations needed such that the equality of the array is less than or equal to $1$.
Each test contains multiple test cases. The first line contains a single integer $t$ ($1 \leq t \leq 10^4$) — the number of test cases. The description of the test cases follows.
The first line of each test case contains an integer $n$ ($2 \le n \le 2 \cdot 10 ^ 5$) — the length of array $a$.
The second line of each test case contains $n$ integers $a_1, a_2, \ldots, a_n$ ($1 \le a_i \le 10^9$) — elements of the array.
It is guaranteed that the sum of $n$ over all test cases does not exceed $2 \cdot 10 ^ 5$
For each test case, print the minimum number of operations needed.
Input
Each test contains multiple test cases. The first line contains a single integer $t$ ($1 \leq t \leq 10^4$) — the number of test cases. The description of the test cases follows.
The first line of each test case contains an integer $n$ ($2 \le n \le 2 \cdot 10 ^ 5$) — the length of array $a$.
The second line of each test case contains $n$ integers $a_1, a_2, \ldots, a_n$ ($1 \le a_i \le 10^9$) — elements of the array.
It is guaranteed that the sum of $n$ over all test cases does not exceed $2 \cdot 10 ^ 5$
Output
For each test case, print the minimum number of operations needed.
Samples
4
5
1 1 1 1 1
5
2 1 1 1 2
6
1 1 2 3 3 4
6
1 2 1 4 5 4
2
1
2
0
Note
In the first test case, we can select $i=2$ and $x=2$ to form $[1, 2, 2, 1, 1]$. Then, we can select $i=3$ and $x=3$ to form $[1, 2, 3, 3, 1]$.
In the second test case, we can select $i=3$ and $x=100$ to form $[2, 1, 100, 100, 2]$.