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index.js
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index.js
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/**
* Definition for singly-linked list.
* function ListNode(val) {
* this.val = val;
* this.next = null;
* }
*/
/**
* @param {ListNode} head
* @param {number} m
* @param {number} n
* @return {ListNode}
*/
var reverseBetween = function(head, m, n) {
let i = 1;
let left, right;
let node = head;
let arr = [];
let preHead = new ListNode();
preHead.next = head;
let prenode = preHead;
left = prenode.next;
if( m >= n){
return head;
}
while(node){
if(i === n){
left.next = node.next;
let tem = node;
tem.next = prenode.next
prenode.next = tem;
node = null;
}else if(i > m){
let tem = node;
node = node.next;
tem.next = prenode.next
prenode.next = tem;
}else{
if((i+1) === m){
prenode = node;
left = node.next;
}
node = node.next;
}
i++;
}
console.log(preHead)
return preHead.next;
};