public/subjects/sortll.en.md

sortlinkedlist

WARNING! VERY IMPORTANT!

For this exercise a function will be tested with the exam own main. However the student still needs to submit a structured program:

This means that:

• The package needs to be named package main.
• The submitted code needs one declared function main(func main()) even if empty.
• The function main declared needs to also pass the Restrictions Checker(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
• Every other rules are obviously the same than for a program.

Instructions

You are given a linked list, where each node contains a single digit. Write a function that sorts the list in descending order and return pointer/reference to new linked list

Expected function and struct

package piscine

type Node struct {
	Next *Node
	Num  int
}

func Sortll(node *Node) *Node {

}

Usage

Here is a possible program to test your function:

package main

import (
    "fmt"
    piscine ".."
)

// I implemented pushBack for this

func main() {
	num1 := &piscine.Node{Num: 5}
	num1 = pushBack(num1, 1)
	num1 = pushBack(num1, 3)
	num1 = pushBack(num1, 1)
	num1 = pushBack(num1, 3)

	result := piscine.Sortll(num1)
	for tmp := result; tmp != nil; tmp = tmp.Next {
		fmt.Print(tmp.Num)
		if tmp.Next != nil {
			fmt.Print(" -> ")
		}
	}
	fmt.Println()
}

Its output:

$> go build
$> ./main
5 -> 3 -> 3 -> 1 -> 1