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

Java Arraylist

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795 Discussions

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  • 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!");
        }    
}

  • gracelyganta
     + 0 comments
    import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        String s = sc.nextLine();
        ArrayList<ArrayList<String>> a = new ArrayList<ArrayList<String>>(n);
        for (int i = 0; i < n; i++) {
            s = sc.nextLine();
            a.add(i, new ArrayList<String>(Arrays.asList(s.split("\\s"))));
        }

        int m = sc.nextInt();
        for (int i = 0; i < m; i++) {
            int x = sc.nextInt();
            int y = sc.nextInt();
            if (x <= a.size() && y < a.get(x-1).size() && y >= 0) {
                System.out.println(a.get(x-1).get(y));
            } else {
                System.out.println("ERROR!");
            }
        }
    }
}

  • d24it157
     + 0 comments

    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 sc = new Scanner(System.in);
    ArrayList<ArrayList<Integer>> arr = new ArrayList<ArrayList<Integer>>();

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

    int q = sc.nextInt();
    for (int i = 0; i < q; i++) {
        int x = sc.nextInt();
        int y = sc.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!");
        }    
    }
}

  • n4m774r_d
     + 0 comments
    import java.io.*;
import java.util.*;
import java.util.stream.Collectors;

class Output {
    public void getNum(List<List<Integer>> D,List<List<Integer>> X){
        for (List<Integer> sublist : X) {
            int y = sublist.get(0) - 1;
            int x = sublist.get(1) - 1;
            try {System.out.println(D.get(y).get(x));}
            catch (IndexOutOfBoundsException e) {System.out.println("ERROR!");}
        }
    }
};

public class Solution {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        List<List<Integer>> D = new ArrayList<>();
        List<List<Integer>> X = new ArrayList<>();
        int N = sc.nextInt();sc.nextLine();
        for (int i = 0; i < N; i++) 
            {D.add(Arrays.stream(sc.nextLine().trim().split("\\s+")).skip(1)
            .map(Integer::parseInt).collect(Collectors.toList()));}
        int Q = sc.nextInt();sc.nextLine();
        for (int i = 0; i < Q; i++) 
            {X.add(Arrays.stream(sc.nextLine().trim().split("\\s+"))
            .map(Integer::parseInt).collect(Collectors.toList()));}
        Output output = new Output();
        output.getNum(D,X);
        
    }
}