You are given an integer n representing n teams. You are asked to generate a schedule such that:
schedule[i] is the match on day i.Return a 2D integer array schedule, where schedule[i][0] represents the home team and schedule[i][1] represents the away team. If multiple schedules meet the conditions, return any one of them.
If no schedule exists that meets the conditions, return an empty array.
\n\n\n
Example 1:
\n\nInput: n = 3
\n\nOutput: []
\n\nExplanation:
\n\nSince each team plays every other team exactly twice, a total of 6 matches need to be played: [0,1],[0,2],[1,2],[1,0],[2,0],[2,1].
It's not possible to create a schedule without at least one team playing consecutive days.
\nExample 2:
\n\nInput: n = 5
\n\nOutput: [[0,1],[2,3],[0,4],[1,2],[3,4],[0,2],[1,3],[2,4],[0,3],[1,4],[2,0],[3,1],[4,0],[2,1],[4,3],[1,0],[3,2],[4,1],[3,0],[4,2]]
\n\nExplanation:
\n\nSince each team plays every other team exactly twice, a total of 20 matches need to be played.
\n\nThe output shows one of the schedules that meet the conditions. No team plays on consecutive days.
\n\n
Constraints:
\n\n2 <= n <= 50给你一个整数 n，表示 n 支队伍。你需要生成一个赛程，使得：
schedule[i] 表示第 i 天的比赛。返回一个 2D 整数数组 schedule，其中 schedule[i][0] 表示主队，schedule[i][1] 表示客队。如果有多个满足条件的赛程，返回 其中任意一个 。
如果没有满足条件的赛程，返回空数组。
\n\n\n\n
示例 1：
\n\n输入： n = 3
\n\n输出： []
\n\n解释：
\n\n因为每支队伍与其他队伍恰好比赛两次，总共需要进行 6 场比赛：[0,1],[0,2],[1,2],[1,0],[2,0],[2,1]。
所有赛程都至少有一支队伍在连续两天比赛，所以无法创建一个赛程。
\n示例 2：
\n\n输入： n = 5
\n\n输出： [[0,1],[2,3],[0,4],[1,2],[3,4],[0,2],[1,3],[2,4],[0,3],[1,4],[2,0],[3,1],[4,0],[2,1],[4,3],[1,0],[3,2],[4,1],[3,0],[4,2]]
\n\n解释：
\n\n因为每支队伍与其他队伍恰好比赛两次，总共需要进行 20 场比赛。
\n\n输出显示了满足条件的其中一个赛程。没有队伍在连续的两天内比赛。
\n\n\n
提示：
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