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java map hackerrank solution - Java 15

   java map hackerrank solution - Java 15 for explanation watch video : Code: import  java.io.*; import  java.util.*; public   class  Solution {      public   static   void  main(String[] args) {         Scanner scn =  new  Scanner(System.in);          int  n = scn.nextInt();         scn.nextLine();         HashMap<String,Integer> hm =  new  HashMap<>();          for ( int  i= 0 ;i<n;i++){             String name = scn.nextLine();              int  mobile = scn.nextInt();    ...

Tree : Top View Hackerrank Solution - java

Tree : Top View Hackerrank Solution for explanation watch Video :  Code:  import  java.util.*; import  java.io.*; class  Node {     Node left;     Node right;      int  data;          Node( int  data) {          this .data = data;         left = null;         right = null;     } } class  Solution {      /*           class Node          int data;         Node left;         Node right;     */      static   cla...

Java Arraylist Hackerrank Solution

 Java Arraylist Hackerrank Solution For Explanation Check Video: Sample Input 5 5 41 77 74 22 44 1 12 4 37 34 36 52 0 3 20 22 33 5 1 3 3 4 3 1 4 3 5 5 Sample Output 74 52 37 ERROR! ERROR! Code: import  java.io.*; import  java.util.*; public   class  Solution {      public   static   void  main(String[] args) {         Scanner scn =  new  Scanner(System.in);          int  n = scn.nextInt();         ArrayList<ArrayList<Integer>> al =  new  ArrayList<ArrayList<Integer>>();          for ( int  i= 0 ;i<n;i++){              int  d = scn.nextInt();          ...