Min-Sum-Max
本题没有可用的提交语言。
Description
Tom is waiting for his results of Zhongkao examination. To ease the tense atmosphere, his friend, Daniel, decided to play a game with him. This game is called "Divide the Array".
The game is about the array $a$ consisting of $n$ integers. Denote $[l,r]$ as the subsegment consisting of integers $a_l,a_{l+1},\ldots,a_r$.
Tom will divide the array into contiguous subsegments $[l_1,r_1],[l_2,r_2],\ldots,[l_m,r_m]$, such that each integer is in exactly one subsegment. More formally:
- For all $1\le i\le m$, $1\le l_i\le r_i\le n$;
- $l_1=1$, $r_m=n$;
- For all $1< i\le m$, $l_i=r_{i-1}+1$.
Denote $s_{i}=\sum_{k=l_i}^{r_i} a_k$, that is, $s_i$ is the sum of integers in the $i$-th subsegment. For all $1\le i\le j\le m$, the following condition must hold:
$$ \min_{i\le k\le j} s_k \le \sum_{k=i}^j s_k \le \max_{i\le k\le j} s_k. $$
Tom believes that the more subsegments the array $a$ is divided into, the better results he will get. So he asks Daniel to find the maximum number of subsegments among all possible ways to divide the array $a$. You have to help him find it.
The first line of input contains a single integer $t$ ($1\le t\le 50$) — the number of test cases. The description of test cases follows.
The first line of each test case contains a single integer $n$ ($1\le n\le 300$) — the length of the array $a$.
The second line of each test case contains $n$ integers $a_1,a_2,\ldots,a_n$ ($-10^9\le a_i\le 10^9$) — the elements of the array $a$.
It is guaranteed that the sum of $n$ over all test cases does not exceed $1000$.
For each test case, output a single integer — the maximum number of subsegments among all possible ways to divide the array $a$.
Input
The first line of input contains a single integer $t$ ($1\le t\le 50$) — the number of test cases. The description of test cases follows.
The first line of each test case contains a single integer $n$ ($1\le n\le 300$) — the length of the array $a$.
The second line of each test case contains $n$ integers $a_1,a_2,\ldots,a_n$ ($-10^9\le a_i\le 10^9$) — the elements of the array $a$.
It is guaranteed that the sum of $n$ over all test cases does not exceed $1000$.
Output
For each test case, output a single integer — the maximum number of subsegments among all possible ways to divide the array $a$.
8
3
-1 5 4
2
2023 2043
6
1 4 7 -1 5 -4
5
-4 0 3 -18 10
1
998244853
10
-4 2 5 -10 4 8 2 9 -15 7
7
-7 3 8 -9 -2 2 4
4
-5 5 -2 -5
2
1
3
2
1
6
5
3
Note
In the first test case, Daniel can divide the array into $[-1]$ and $[5,4]$, and $s=[-1,9]$. It can be shown that for any $i=j$, the condition in the statement is already satisfied, and for $i=1,j=2$, we have $\min(-1,9)\le (-1)+9\le \max(-1,9)$.
In the second test case, if Daniel divides the array into $[2023]$ and $[2043]$, then for $i=1,j=2$ we have $2023+2043>\max(2023,2043)$, so the maximum number of subsegments is $1$.
In the third test case, the optimal way to divide the array is $[1,4,7],[-1],[5,-4]$.
In the fourth test case, the optimal to divide the array way is $[-4,0,3,-18],[10]$.
In the fifth test case, Daniel can only get one subsegment.