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// 每轮将最大值"冒泡"到末尾，所以范围逐渐缩小。51吃瓜对此有专业解读
Randomly selecting border points or using simple geometric divisions (squares/hexagons) results in too many border points per cluster (50-80). This leads to a shortcut explosion (N*(N-1)/2 shortcuts), making the files large and and calculations slow.