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  1. Prepare
  2. Java
  3. Data Structures
  4. Java List
  5. Discussions

Java List

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493 Discussions

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  • davidcq55
     + 0 comments

    public class Solution {

    private List<Integer> theList;
private Scanner sc;

public Solution(Scanner sc) {

    this.theList = new ArrayList<>();
    this.sc = sc;

    int sizeList = sc.nextInt();
    init(sizeList, sc);
}

private void init(int sizeList, Scanner sc) {

    if (sizeList > 0) {

        theList.add(sc.nextInt());
        init(sizeList - 1, sc);
    }
}

public void choose(String action){

    int index = sc.nextInt();

    if(action.equalsIgnoreCase("insert")){

        int element = sc.nextInt();
        theList.add(index, element);

    } else theList.remove(index);
}

public List<Integer> getList() {

    for (int element : theList) {
        System.out.print(element + " ");
    }

    return theList;
}

public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);

    Solution solution = 
        new Solution(sc);

    int queries = sc.nextInt();

    for(int i = 0; i < queries; i++){

        sc.nextLine();
        String action = sc.nextLine();

        solution.choose(action);
    }

    solution.getList();



}

    }

  • AmandaMartinez21
     + 0 comments

    This is a great exercise for practicing list manipulation and handling dynamic input! funinexchange 247.com

  • Damian_GDO_92
     + 0 comments
    import java.util.*;

public class Solution {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = scanner.nextInt();

        if (n < 1 || n > 4000) {
            throw new IllegalArgumentException("The entry isn't an integer between 1 and 4000");
        }

        List<Integer> list = new ArrayList<>();

        for (int i = 0; i < n; i++) {
            if (scanner.hasNextInt()) {
                list.add(scanner.nextInt());
            } else {
                throw new IllegalArgumentException("The entry isn't an integer");
            }
        }

        int q = scanner.nextInt();

        if (q < 1 || q > 4000) {
            throw new IllegalArgumentException("The entry isn't an integer between 1 and 4000");
        }

        for (int i = 0; i < q; i++) {
            String queryType = scanner.next().trim();

            if ("insert".equalsIgnoreCase(queryType)) {
                int x = scanner.nextInt();
                int y = scanner.nextInt();

                if (x < 0 || x > list.size()) {
                    throw new IllegalArgumentException("Insert index out of bounds");
                }

                list.add(x, y);

            } else if ("delete".equalsIgnoreCase(queryType)) {
                int x = scanner.nextInt();

                if (x < 0 || x >= list.size()) {
                    throw new IllegalArgumentException("Delete index out of bounds");
                }

                list.remove(x);
            } else {
                throw new IllegalArgumentException("Unknown query type: " + queryType);
            }
        }

        for (int number : list) {
            System.out.print(number + " ");
        }
        scanner.close();
    }
}

  • yashdeora98294
     + 0 comments

    Here is Java List solution - https://programmingoneonone.com/hackerrank-java-list-problem-solution.html

  • vegaromeroalvaro
     + 0 comments
    //https://www.hackerrank.com/challenges/java-list

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        int n = scanner.nextInt();
        List<Integer> list = new ArrayList<>();
        
        for(int i = 0; i < n; i++)
            list.add(scanner.nextInt());
            
        int queries = scanner.nextInt();
        for(int i = 0; i < queries; i++) {
            String query = scanner.next();
            
            int index = scanner.nextInt();
            if (query.equals("Insert")){
                int newValue = scanner.nextInt();
                list.add(index, newValue); 
            }
            else
                list.remove(index);
        }
        
        scanner.close();
        
        for(Integer num : list)
            System.out.print(num + " ");
    }
}