定方向：求「下一个」→ 倒序；求「上一个」→ 正序。
Option 1: The system can update the cost of that specific shortcut in the base graph and quickly re-run the Dijkstra search (Step 2) on the abstract graph to find an alternative high-level path.
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for (let i = len - 1; i = 0; i--) {
She says she has no regrets about bringing her astronaut career to an end. She made her decision and didn't look back. But there's still a wistful look in her eye when we ask if she'd be tempted if a seat on a spacecraft became free.
BAS' selection process tests for conflict-handling and problem-solving abilities, which is followed by thorough pre-deployment training for successful candidates.