init

package main

import "fmt"

// go run init.go xxx.go
type ListNode struct {
    Val  int
    Next *ListNode
}

func newList(nums []int) *ListNode {
    n := len(nums)
    if n == 0 {
        return nil
    }
    head := &ListNode{Val: nums[0], Next: nil}
    cur := head
    for i := 1; i < n; i++ {
        newNode := &ListNode{Val: nums[i], Next: nil}
        cur.Next = newNode
        cur = newNode
    }
    return head
}

func (cur *ListNode) String() string {
    counts := 0
    var nums []int
    for cur != nil {
        nums = append(nums, cur.Val)
        counts++
        cur = cur.Next
    }
    return fmt.Sprintf("%d nodes: %v", counts, nums)
}