题解 | #7.链表中环的入口结点#
链表中环的入口结点
http://www.nowcoder.com/practice/253d2c59ec3e4bc68da16833f79a38e4
借助Set
/*function ListNode(x){
this.val = x;
this.next = null;
}*/
function EntryNodeOfLoop(pHead)
{
let set = new Set();
while(pHead != null){
if ( set.has(pHead) ) return pHead;
set.add(pHead);
pHead = pHead.next;
}
return null;
}
module.exports = {
EntryNodeOfLoop : EntryNodeOfLoop
};
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