“党中央高度重视‘三农’工作，一定会采取切实有力的政策举措，回应老百姓的关切和需求，把乡村振兴的美好蓝图变为现实。”习近平总书记的承诺字字铿锵。
This step rapidly finds the optimal sequence of border points and shortcuts to get from your start cluster's periphery to your target cluster's periphery. It's incredibly fast because it's ignoring all the tiny roads within intermediate clusters.
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* @param arr 待排序数组