To find these crucial border points, we employed a clever technique based on the Ford-Fulkerson algorithm. By simulating "flooding" roads with traffic from random start/end points, we could identify the natural bottlenecks – the "minimum cut" in graph theory terms. These bottlenecks became our border points.
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// 步骤1：找初始左边界（第一个破坏升序的位置）
* @param {ListNode} head 链表的头节点
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