Java Program for Shortest Un-ordered Subarray
An array is given of n length, and problem is that we have to find the length of shortest unordered {neither increasing nor decreasing} sub array in given array.
Examples:
Input : n = 5
7 9 10 8 11
Output : 3
Explanation : 9 10 8 unordered sub array.
Input : n = 5
1 2 3 4 5
Output : 0
Explanation : Array is in increasing order.
The idea is based on the fact that size of shortest subarray would be either 0 or 3. We have to check array element is either increasing or decreasing, if all array elements are in increasing or decreasing, then length of shortest sub array is 0, And if either the array element is not follow the increasing or decreasing then it shortest length is 3.
Java
import java.util.*;
import java.io.*;
class GFG {
public static boolean increasing( int a[], int n)
{
for ( int i = 0 ; i < n - 1 ; i++)
if (a[i] >= a[i + 1 ])
return false ;
return true ;
}
public static boolean decreasing( int arr[], int n)
{
for ( int i = 0 ; i < n - 1 ; i++)
if (arr[i] < arr[i + 1 ])
return false ;
return true ;
}
public static int shortestUnsorted( int a[], int n)
{
if (increasing(a, n) == true ||
decreasing(a, n) == true )
return 0 ;
else
return 3 ;
}
public static void main (String[] args) {
int ar[] = new int []{ 7 , 9 , 10 , 8 , 11 };
int n = ar.length;
System.out.println(shortestUnsorted(ar,n));
}
}
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Time complexity: O(n) where n is the length of the array.
Auxiliary Space: O(1)
Please refer complete article on Shortest Un-ordered Subarray for more details!
Last Updated :
26 May, 2022
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