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  2. Java
  3. Data Structures
  4. Java List
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Java List

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486 Discussions

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  • heeeeei
     + 0 comments

    May I know what is the issue with my code? It passed Test Case 3 but failed the rest of the Test Cases.

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.nextLine();

        String[] s = sc.nextLine().split(" ");
        List<Integer> L = new ArrayList<>();
        for (String num : s) {
            L.add(Integer.parseInt(num));
        }

        int q = sc.nextInt();
        sc.nextLine();
        while (q > 0) {
            String operation = sc.nextLine();
            if (operation.equalsIgnoreCase("Insert")) {
                String[] xy = sc.nextLine().split(" ");
                L.add(Integer.parseInt(xy[0]), Integer.parseInt(xy[1]));
            }
            else {
                int index = sc.nextInt();
                L.remove(index);
            }
            q--;
        }

        for (Integer num : L) {
            System.out.printf("%d ", num);
        }
    }

  • jhoneder
     + 0 comments

    Use stream

    import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

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

public class Solution {

    private static final String STRING_INSERT = "Insert";
    private static final String STRING_DELETE = "Delete";

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

        int n = Integer.parseInt(scanner.nextLine()); // n is the number initial of elements in the list

        List<Integer> list = getIntegerList(scanner.nextLine());

        int numberOfQuerys = Integer.parseInt(scanner.nextLine());

        while (numberOfQuerys-- > 0) {
            String query = scanner.nextLine();
            List<Integer> queryList = getIntegerList(scanner.nextLine());

            if (query.equals(STRING_INSERT)) {
                list.add(queryList.get(0), queryList.get(1));
            } else if (query.equals(STRING_DELETE)) {
                list.remove((int) queryList.get(0)); // int -> index to delete, Integer -> object to delete
            }
        }
        scanner.close();
        list.forEach(number-> System.out.print(number + " "));
    }

    private static List<Integer> getIntegerList(String scanner) {
        return Arrays.stream(scanner.split(" ")).map(Integer::parseInt).collect(toList());
    }
}

  • sidhantsati
     + 0 comments

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

    public class Solution {

    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n =sc.nextInt();
    ArrayList<Integer> list = new ArrayList<>();
    for(int i=0;i<n;i++){
        list.add(sc.nextInt());
    }
    n=sc.nextInt();
    for(int i=0;i<n;i++){
        String str=sc.next();
        if(str.equals("Insert")){
            int a=sc.nextInt();
            int b=sc.nextInt();
            list.add(a, b);
        }
        if(str.equals("Delete")){
            int a = sc.nextInt();
            list.remove(a);
        }
    }for (int j : list) { System.out.print(j + " "); }
    sc.close();
}

    }

  • hungmanh2607uit1
     + 0 comments

    my code: import java.io.; import java.util.;

    public class Solution {

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

    int n = scan.nextInt();
    List<Integer> l = new ArrayList<>();
    for (int i = 0; i < n; i++) {
        int x = scan.nextInt();
        l.add(x); 
    }

    int m = scan.nextInt();
    scan.nextLine(); 

    for (int i = 0; i < m; i++) {
        String s = scan.nextLine();
        if (s.equals("Insert")) {
            int a = scan.nextInt();
            int b = scan.nextInt();
            l.add(a, b);
            if (scan.hasNextLine()) {
                scan.nextLine(); 
            }
        } else if (s.equals("Delete")) {
            int x = scan.nextInt();
            l.remove(x);
            if (scan.hasNextLine()) {
                scan.nextLine(); 
            }
        }
    }

    for (Integer element : l) {
        System.out.print(element + " ");
    }
}

    }

  • kavib9345
     + 0 comments
    public class Solution {

    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        int n=in.nextInt();
        List<Integer> list=new ArrayList<>(n); 
        for(int i=0;i<n;i++){
            list.add(in.nextInt());
        }  
        int q=in.nextInt();
        for(int j=0;j<q;j++){
            String str=in.next();
            if(str.equalsIgnoreCase("Insert")){
                int x=in.nextInt();
                int y=in.nextInt();
                list.add(x,y);
            }
            if(str.equalsIgnoreCase("delete")){
                int z=in.nextInt();
                list.remove(z);
            }
        }
        for(int num:list){
            System.out.print(num+" ");
        }
    }
}