help... - java

Question

question/task:
https://edabit.com/challenge/Md6usCHQ7Xsj2fQi3

how can i make it work?

my code:

import java.util.*;
public class Main
{

public static void main(String[] args)
{
Integer[] arr = {3,2,1};
order(arr);

}

public static void order(Integer[] arr){

boolean isGood = true;
List<Integer> list = Arrays.asList(arr);
Collections.sort(list);

for (int i = 0; i < list.size()-1; i++){
for (int j = list.get(0); j <= list.size(); j++){

if (list.get(i) != j){
isGood = false;
}

}
}

System.out.println(isGood);
}
}

Answer 1

Yahel there in loop, we have 3 parts
for(initialization part ; loop condition ; increment/decrecents )
{
..//body
}
This is the structure, you can use it as we needed..
No limitation of assignments in 1st block but only allows assignments.., But you should have only 1 condition ; and also no limits in 3rd part, there you can added any proper instructions with comma separations..
Ex : check this code without any loop body, you get output....

for( int i=0,j=0,k=0 ; i<20 && j<10 ; i=i+2, j++, System.out.print(k--))
{
//loop body, now empty
}

Answer 2

The condition :
I<list.get(0) && j < list.size() becomes false 1st itself because i=0, j =4 (list[0]) so list. Size is 3.
So 0<3 && 4< 3 False.
No need j<list. size(), just use i<list.size() is enough...

Answer 3

No need 2 loops,
Try change to this : single loop
for (int j = list.get(0),i=0; j < list.size();i++, j++){

Also on false, you can break loop..

Answer 4

Jayakrishna🇮🇳 wow, I have never seen a for loop with more than one increasing variable.. it's quite new to me. Do you have a video, article or any explanation about it?

Answer 5

Jayakrishna🇮🇳, Thanks! but whats the problem now?
code:

import java.util.*;
public class Main
{

public static void main(String[] args)
{
Integer[] arr = {4,10,3};
order(arr);

}

public static void order(Integer[] arr){

boolean isGood = true;
List<Integer> list = Arrays.asList(arr);
Collections.sort(list);

for (int i = 0, j = list.get(0); i < list.size() && j <= list.size(); i++, j++){

if (list.get(i) != j){
isGood = false;
}

}

System.out.println(isGood);
}
}

Answer 6

Jayakrishna🇮🇳, Thanks! Its working great!

Answer 7

You're welcome...