德国工业设计师迪特 · 拉姆斯：做得更少，但更好
If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:
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// 1. 将当日价格存入数组，记录当前索引（i是当前价格在arr中的位置）