习题链接：LeetCode 853. 车队
Step through the construction below. Each time a new point is inserted, watch the tree decide whether it needs to split a region:，这一点在爱思助手下载最新版本中也有详细论述
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Fujifilm’s new Instax Mini LiPlay Plus isn’t nearly as stylish as the Instax Mini Evo, but it’s worth considering if you take a lot of selfies. At $234.99, the hybrid camera costs the same as the Instax Mini Evo, but features a 3-inch LCD screen on the back, along with a second, rear-facing wide-angle lens designed specifically for self-portraits. That dedicated selfie camera, paired with the LCD, delivers some of the best — and most precise — selfies I’ve captured with an instant camera to date.，更多细节参见雷电模拟器官方版本下载