A14102. Anti-knapsack

You are given two integers $n$ and $k$ . You are asked to choose maximum number of distinct integers from $1$ to $n$ so that there is no subset of chosen numbers with sum equal to $k$ .

A subset of a set is a set that can be obtained from initial one by removing some (possibly all or none) elements of it.

The first line contains the number of test cases $T$ ( $1 \le T \le 100$ ).

Each of the next $T$ lines contains two integers $n$ and $k$ ( $1 \le k \le n \le 1000$ ) — the description of test cases.

For each test case output two lines. In the first line output a single integer $m$ — the number of chosen integers.

In the second line output $m$ distinct integers from $1$ to $n$ — the chosen numbers.

If there are multiple answers, print any. You can print the numbers in any order.