heap-inset-peek-delete-heapify.java

import java.util.*;

public class Main{
    
    static class Heap{
        
        ArrayList<Integer> arr = new ArrayList<>();
        
        public void add(int data){
            //add at last Ind
            arr.add(data);
            
            int x = arr.size()-1; //x is child Index 
            int par = (x-1)/2; //par index 
            
            while(arr.get(x)<arr.get(par)){
                
                //swap
                int temp = arr.get(x);
                arr.set(x, arr.get(par));
                arr.set(par, temp);
            }
            
            public int peek(){
                return arr.get(0);
            }
    
        }
    }
    
    
    
public class Main(String[]args){
    
    
    
    
}  
   }