题解 | #链表中环的入口结点#

/*function ListNode(x){
    this.val = x;
    this.next = null;
}*/
function EntryNodeOfLoop(pHead)
{
    while(pHead !== null){
        if(pHead.flag){
            return pHead
        }else{
            pHead.flag = true;
            pHead = pHead.next
        }
    }
    return null
}
module.exports = {
    EntryNodeOfLoop : EntryNodeOfLoop
};