* @param arr 待排序数组
Mostly. This is because, theoretically, we could still save the ISS and move it into higher orbit. NASA has calculated that propelling the station more than 640 kilometers above Earth would keep it alive for 100 years—and also require at least 18.9 metric tons of propellant. That’s roughly 2,000 airline carry-ons. A thousand years would require at least 36 metric tons. If that doesn’t seem like very much, consider the fact that, right now, no vehicle can transport that amount of gas to the station. The still-in-development SpaceX megarocket Starship might be able to haul a significant percentage, but it would struggle to dock with the station, according to the space agency’s estimations.
，推荐阅读im钱包官方下载获取更多信息
没有什么固定公式；有人在黎明时分状态最佳，有人则在夜深人静时灵感最盛。
新与旧的对抗不可避免，最终的胜利者，只会是那些在变革前夜，就已经在勇敢追逐的玩家。
const posToTime = new Map(); // 映射：位置 → 到达终点的时间