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

Java Arraylist

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  • jhoneder
     + 0 comments
    import java.util.List;
import java.util.Scanner;
import java.util.stream.Stream;

import static java.util.stream.Collectors.toList;


public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int numberOfArrays = getInputNumber(scanner);
        int numberOfQuerys = 0;
        List<List<Integer>> arraysOfNumbers = new ArrayList<>();
        List<List<Integer>> arrayOfQuery = new ArrayList<>();// x , y in every query

        for (int i = 0; i < numberOfArrays; i++) {
            List<Integer> list = getInputListNumbers(scanner);
            list.remove(0);
            arraysOfNumbers.add(list);
        }

        numberOfQuerys = getInputNumber(scanner);
        while (numberOfQuerys-- > 0) {
            arrayOfQuery.add(getInputListNumbers(scanner));
        }
        scanner.close();

        arrayOfQuery.forEach(list -> {
            int x = list.get(0); // position in array of numbers
            int y = list.get(1);// position in array
            printNumber(x, numberOfArrays, arraysOfNumbers, y);
        });
    }

    private static void printNumber(int x, int numberOfArrays, List<List<Integer>> arraysOfNumbers, int y) {
        if(x <0 || x > numberOfArrays){
            System.out.println("ERROR!");
        }
        List<Integer> array = arraysOfNumbers.get(x -1);
        try{
            System.out.println(array.get(y -1));
        }catch (Exception e){
            System.out.println("ERROR!");
        }
    }

    private static int getInputNumber(Scanner scanner) {
        return Integer.parseInt(scanner.nextLine());
    }

    private static List<Integer> getInputListNumbers(Scanner scanner) {
        return Stream.of(scanner.nextLine().split(" ")).map(Integer::parseInt).collect(toList());
    }
}

  • manochitragopal1
     + 0 comments

    Scanner sc = new Scanner(System.in); int p = sc.nextInt(); List> lisOfLis = new ArrayList<>(); for(int i=0;i list1 = new ArrayList<>();
    for(int j=0;j= 0 && x < p && y >= 0 && y < lisOfLis.get(x).size()){ List newlist = lisOfLis.get(x); System.out.println(newlist.get(y)); }else{ System.out.println("ERROR!"); }
    }
    sc.close();

  • hungmanh2607uit1
     + 0 comments

    my code:

    import java.util.ArrayList; import java.util.Scanner;

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

        ArrayList<ArrayList<Integer>> ml = new ArrayList<>();

    int n = scan.nextInt();      
    for (int i = 0; i < n; i++) {
        int x = scan.nextInt();
        ArrayList<Integer> list = new ArrayList<>();
        for (int j = 0; j < x; j++) {
            int z = scan.nextInt();
            list.add(z);
        }
        ml.add(list);
    }

    int m = scan.nextInt();
    for(int i=0; i<m; i++){
        int a= scan.nextInt();
        int b= scan.nextInt();
        try{
            System.out.println(ml.get(a-1).get(b-1));
        }
        catch(IndexOutOfBoundsException e){
            System.out.println("ERROR!");
        }
    }

    scan.close();
}

    }

  • pagarashvini000
     + 0 comments
            ****Scanner sc =new Scanner(System.in);
        ArrayList<ArrayList<Integer>>arr= new ArrayList<ArrayList<Integer>>();
        
        int n= sc.nextInt();
        for(int i=0; i<n; i++){
            arr.add(new ArrayList<Integer>());
            int d= sc.nextInt();
            for(int j=0; j<d; j++){
                arr.get(i).add(sc.nextInt());
                }
        }
        int q= sc.nextInt();
        for(int k=0; k<q; k++){
            int x=sc.nextInt();
            int y=sc.nextInt();
            try{
                System.out.println(arr.get(x-1).get(y-1));
            }catch(Exception e){
                System.out.println("ERROR!");
            }
        }

  • maninder_singh21
     + 0 comments

    public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        ArrayList<ArrayList<Integer>> arr = new ArrayList<ArrayList<Integer>>(n);

        for(int i=0;i<n;i++){            
                int d = in.nextInt();
                arr.add(new ArrayList<Integer>());
                for(int j=0;j<d;j++){
                        arr.get(i).add(in.nextInt());
                }
        }

        int q = in.nextInt();

        for (int i = 0; i < q; i++) {
        int x = in.nextInt();
        int y = in.nextInt();
        try{    
                if (arr.get(x - 1).get(y - 1) != null) {
                        System.out.println(arr.get(x - 1).get(y - 1));

                } else {
                        System.out.println("ERROR!");
                }
        }    
        catch(Exception e){
        System.out.println("ERROR!");
        }    
}