▲ Eddy Cue 与 Tim Cook
Exclusive: Home affairs department intervened about the use of non-modified people movers after 500 detention centre staff flagged safety concerns
，详情可参考91视频
输出：[4,2,4,-1,4]（最后一个 3 绕一圈找到 4）
void merge(int arr[], int left, int mid, int right) {
The result from Step 2 is a high-level route – a sequence of shortcuts connecting border points.