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max_difference_in_array.java

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//algo 1 : O(n2) => for each two find diff and max of diff

//algo 2 : O(nlogn) => sort and arr[high]-arr[low]

//algo 3: O(n) => find max and min

/* package whatever; // don't place package name! */

import java.util.*;

import java.lang.*;

import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */

class Ideone

{

public static void main (String[] args) throws java.lang.Exception

{

Scanner sc=new Scanner(System.in);

int n=sc.nextInt();

int[]arr=new int[n];

for(int i=0;i<n;i++)

arr[i]=sc.nextInt();

int max=Integer.MIN_VALUE,min=Integer.MAX_VALUE;

for(int i=0;i<n;i++)

{

if(arr[i]>max)

max=arr[i];

if(arr[i]<min)

min=arr[i];

}

System.out.println("maximum difference is :"+(max-min));

}

}