package main
import . "nc_tools"
func deleteNode( head *ListNode , val int ) *ListNode {
//1.开头
//2.中间、末尾
cur := &ListNode{Val:-1}
cur.Next = head
sentry := cur
prev := cur
for cur != nil {
if cur.Val == val {
prev.Next = cur.Next
}
prev = cur
cur = cur.Next
}
return sentry.Next
}