# B - Anti-knapsack

B - Anti-knapsack

代码如下

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;

int main()
{
	ll t;
	cin >> t;
	while (t--)
	{
		ll n, k;
		cin >> n >> k;
		vector<ll> ans;
		for (ll i = k + 1; i <= n; i++)
		{
			ans.push_back(i);
		}
		ll jie;
		if (k % 2 == 0)
			jie = k / 2;
		else
			jie = (k + 1) / 2;
		for (ll i = jie; i < k; i++)
			ans.push_back(i);
		cout << ans.size() << endl;
		for (int i = 0; i < ans.size(); i++)
		{
			cout << ans[i];
			if (i != ans.size() - 1)
				cout << " ";
			else
				cout << endl;
		}
	}
}