"message": "Amount must be non-zero."
const output = Stream.pull(source, toUpperCase);
，这一点在safew官方版本下载中也有详细论述
Медведев вышел в финал турнира в Дубае17:59
思路：① 算每辆车到达时间 = (target - position) / speed；② 按位置降序排序；③ 单调递增栈：仅当当前时间 栈顶时间时压栈（新车队），否则合并。栈长即为车队数。可优化为用变量代替栈。
When we visited the set on a recent freezing afternoon in Paju city, just north of Seoul, filming was moving at breakneck speed.