shetia

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```js // 不知道有没有重复的元素, 那就直接取了最前出现的, 时间复杂度O(n), 空间复杂度O(1) function getIndex(arr){ let index = -1; let min = Infinity for(let i = 0; i < arr.length; i++){ if(arr[i] > 0 && arr[i] <...

[力扣 25. K 个一组翻转链表](https://leetcode-cn.com/problems/reverse-nodes-in-k-group/) ```js var reverseKGroup = function(head, k) { if (!head) return head let fast = head let i = k // 一. 判断是否够长 while (i--) { if...