题解 | #链表中环的入口结点#
链表中环的入口结点
https://www.nowcoder.com/practice/253d2c59ec3e4bc68da16833f79a38e4
package main
func EntryNodeOfLoop(pHead *ListNode) *ListNode {
p := pHead
q := pHead
for p != nil && q != nil {
p = p.Next
q = q.Next
if q != nil {
q = q.Next
}
if p == q {
break
}
}
p = pHead
for p != nil && q != nil {
if p == q {
return q
}
p = p.Next
q = q.Next
}
return nil
}
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