// 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
Close relatives of animals can become multicellular if distinct individuals join together or if dividing cells remain attached. A species has been found to use both mechanisms.，详情可参考夫子
We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.，推荐阅读safew官方版本下载获取更多信息
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