What if you create a truly unique routing profile that's wildly different from the common ones for which shortcuts were pre-calculated? The system is smart. If it detects that too many shortcuts (~50, for example) need on-the-fly recalculation and deviate significantly, it might determine that falling back to the original, comprehensive A* algorithm for the entire route would actually be faster than doing many small, heavily modified A* calculations.
Do a second pass to clean up the code/comments and make further optimizations
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// 定义nums1和nums2的长度（保持你的命名风格）
Pull-through transforms
// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位