A15614 | Add Plus Minus Sign
时间限制1s
内存限制256MB
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题目描述
AquaMoon has a string $a$ consisting of only $0$ and $1$ . She wants to add $+$ and $-$ between all pairs of consecutive positions to make the absolute value of the resulting expression as small as possible. Can you help her?
输入格式
The first line contains a single integer $t$ ( $1 \leq t \leq 2\,000$ ) – the number of test cases. The description of test cases follows.
The first line of each test case contains a single integer $n$ ( $2 \leq n \leq 100$ ) — the length of $a$ .
The second line of each test case contains a string $a$ of length $n$ , consisting of only $0$ and $1$ .
The first line of each test case contains a single integer $n$ ( $2 \leq n \leq 100$ ) — the length of $a$ .
The second line of each test case contains a string $a$ of length $n$ , consisting of only $0$ and $1$ .
输出格式
For each test case, output a string of length $n - 1$ consisting of $-$ and $+$ on a separate line. If there is more than one assignment of signs that produces the smallest possible absolute value, any of them is accepted.
输入输出样例
输入 #1
3 2 11 5 01101 5 10001
输出 #1
- +-++ +++-
In the first test case, we can get the expression $1 - 1 = 0$ , with absolute value $0$ .
In the second test case, we can get the expression $0 + 1 - 1 + 0 + 1 = 1$ , with absolute value $1$ .
In the third test case, we can get the expression $1 + 0 + 0 + 0 - 1 = 0$ , with absolute value $0$ .
In the second test case, we can get the expression $0 + 1 - 1 + 0 + 1 = 1$ , with absolute value $1$ .
In the third test case, we can get the expression $1 + 0 + 0 + 0 - 1 = 0$ , with absolute value $0$ .
C++ 编辑器
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评测结果：Accepted