A14425 | Excellent Arrays

Let's call an integer array $a_1, a_2, \dots, a_n$ good if $a_i \neq i$ for each $i$ .

Let $F(a)$ be the number of pairs $(i, j)$ ( $1 \le i < j \le n$ ) such that $a_i + a_j = i + j$ .

Let's say that an array $a_1, a_2, \dots, a_n$ is excellent if:

- $a$ is good;
- $l \le a_i \le r$ for each $i$ ;
- $F(a)$ is the maximum possible among all good arrays of size $n$ .

Given $n$ , $l$ and $r$ , calculate the number of excellent arrays modulo $10^9 + 7$ .

The first line contains a single integer $t$ ( $1 \le t \le 1000$ ) — the number of test cases.

The first and only line of each test case contains three integers $n$ , $l$ , and $r$ ( $2 \le n \le 2 \cdot 10^5$ ; $-10^9 \le l \le 1$ ; $n \le r \le 10^9$ ).

It's guaranteed that the sum of $n$ doesn't exceed $2 \cdot 10^5$ .

For each test case, print the number of excellent arrays modulo $10^9 + 7$ .