第二盏灯：位置在右下方 (1, -2, -4)，负责照亮物体的背面或暗部。
晚上6点10分，电话铃声再次响起来，阿爸又站起来接电话，对方催促阿爸快点过去，要开饭了。
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"We know that very well from later periods, but in this very formative period of history, it's not very well understood. So it's a really exciting opportunity."
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* 时间复杂度: O(nlogn) 最坏: O(n²) 空间复杂度: O(logn) 稳定: ✗