版权声明:原创勿转 https://cloud.tencent.com/developer/article/1412967
主要是如何获得随机的效果
type ListNode struct {
Val int
Next *ListNode
}
type Solution struct {
count int
head *ListNode
pool []int
}
/** @param head The linked list's head.
Note that the head is guaranteed to be not null, so it contains at least one node. */
func Constructor(head *ListNode) Solution {
var s Solution
s.head = head
return s
}
/** Returns a random node's value. */
func (this *Solution) GetRandom() int {
r := rand.Intn(this.count + 1)
this.count++
if r == this.count-1 && this.head != nil {
t := this.head
this.head = this.head.Next
this.pool = append(this.pool, t.Val)
return t.Val
} else {
return this.pool[r%len(this.pool)]
}
}