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// : 2 ms, Reverse Nodes in k-GroupJava88.82% 
// : 40 MB, Reverse Nodes in k-GroupJava46.14% 

class Solution {
    public ListNode reverseKGroup(ListNode head, int k) {
        //
        //k=1
        if(head == null || head.next == null || k 40m
        while(x
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