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Longest subarray in which all elements are greater than K
• Difficulty Level : Basic
• Last Updated : 21 May, 2021

Given an array of N integers and a number K, the task is to find the length of the longest subarray in which all the elements are greater than K.
Examples:

Input: a[] = {3, 4, 5, 6, 7, 2, 10, 11}, K = 5
Output: 2
There are two possible longest subarrays of length 2.
They are {6, 7} and {10, 11}.
Input: a[] = {8, 25, 10, 19, 19, 18, 20, 11, 18}, K = 13
Output: 4
The longest subarray is {19, 19, 18, 20}.

The idea is to start traversing the array using a counter. If the current element is greater than the given value X, increment the counter otherwise replace the previous length with the maximum of the previous length and current counter and reset the counter.
Below is the implementation of the above approach.

## C++

 `// C++ program to print the length of the longest``// subarray with all elements greater than X``#include ``using` `namespace` `std;` `// Function to count number of segments``int` `longestSubarray(``int` `a[], ``int` `n, ``int` `x)``{``    ``int` `count = 0;` `    ``int` `length = 0;` `    ``// Iterate in the array``    ``for` `(``int` `i = 0; i < n; i++) {` `        ``// check if array element``        ``// greater then X or not``        ``if` `(a[i] > x) {``            ``count += 1;``        ``}``        ``else` `{` `            ``length = max(length, count);` `            ``count = 0;``        ``}``    ``}` `    ``// After iteration complete``    ``// check for the last segment``    ``if` `(count)``        ``length = max(length, count);` `    ``return` `length;``}` `// Driver Code``int` `main()``{``    ``int` `a[] = { 8, 25, 10, 19, 19, 18, 20, 11, 18 };``    ``int` `n = ``sizeof``(a) / ``sizeof``(a);``    ``int` `k = 13;` `    ``cout << longestSubarray(a, n, k);` `    ``return` `0;``}`

## Java

 `// Java program to print the length of the longest``// subarray with all elements greater than X` `import` `java.io.*;` `class` `GFG {`` ` `// Function to count number of segments``static` `int` `longestSubarray(``int` `a[], ``int` `n, ``int` `x)``{``    ``int` `count = ``0``;` `    ``int` `length = ``0``;` `    ``// Iterate in the array``    ``for` `(``int` `i = ``0``; i < n; i++) {` `        ``// check if array element``        ``// greater then X or not``        ``if` `(a[i] > x) {``            ``count += ``1``;``        ``}``        ``else` `{` `            ``length = Math.max(length, count);` `            ``count = ``0``;``        ``}``    ``}` `    ``// After iteration complete``    ``// check for the last segment``    ``if` `(count>``0``)``        ``length = Math.max(length, count);` `    ``return` `length;``}` `// Driver Code``    ``public` `static` `void` `main (String[] args) {``            ``int` `[]a = { ``8``, ``25``, ``10``, ``19``, ``19``, ``18``, ``20``, ``11``, ``18` `};``    ``int` `n = a.length;``    ``int` `k = ``13``;` `  ``System.out.println(longestSubarray(a, n, k));``    ``}``}``// This Code is contributed``// by shs`

## Python3

 `# Python3 program to print the length of``# the longest subarray with all elements``# greater than X` `# Function to count number of segments``def` `longestSubarray(a, n, x):``    ``count ``=` `0``    ``length ``=` `0` `    ``# Iterate in the array``    ``for` `i ``in` `range``(n):``        ` `        ``# check if array element greater``        ``# then X or not``        ``if` `(a[i] > x):``            ``count ``+``=` `1``        ``else``:``            ``length ``=` `max``(length, count)``            ``count ``=` `0``            ` `    ``# After iteration complete``    ``# check for the last segment``    ``if` `(count > ``0``):``        ``length ``=` `max``(length, count)``    ``return` `length` `# Driver Code``if` `__name__ ``=``=` `'__main__'``:``    ``a ``=` `[ ``8``, ``25``, ``10``, ``19``, ``19``,``             ``18``, ``20``, ``11``, ``18` `]``    ``n ``=` `len``(a)``    ``k ``=` `13``    ``print``(longestSubarray(a, n, k))` `# This code is contributed by 29AjayKumar`

## C#

 `// C# program to print the length of the longest``// subarray with all elements greater than X` `using` `System;` `class` `GFG {` `// Function to count number of segments``static` `int` `longestSubarray(``int` `[]a, ``int` `n, ``int` `x)``{``    ``int` `count = 0;` `    ``int` `length = 0;` `    ``// Iterate in the array``    ``for` `(``int` `i = 0; i < n; i++) {` `        ``// check if array element``        ``// greater then X or not``        ``if` `(a[i] > x) {``            ``count += 1;``        ``}``        ``else` `{` `            ``length = Math.Max(length, count);` `            ``count = 0;``        ``}``    ``}` `    ``// After iteration complete``    ``// check for the last segment``    ``if` `(count>0)``        ``length = Math.Max(length, count);` `    ``return` `length;``}` `// Driver Code``    ``public` `static` `void` `Main () {``            ``int` `[]a = { 8, 25, 10, 19, 19, 18, 20, 11, 18 };``    ``int` `n = a.Length;``    ``int` `k = 13;` `Console.WriteLine(longestSubarray(a, n, k));``    ``}``}``// This Code is contributed``// by shs`

## PHP

 ` ``\$x``)``        ``{``            ``\$count` `+= 1;``        ``}``        ``else``        ``{``            ``\$length` `= max(``\$length``, ``\$count``);` `            ``\$count` `= 0;``        ``}``    ``}` `    ``// After iteration complete``    ``// check for the last segment``    ``if` `(``\$count` `> 0)``        ``\$length` `= max(``\$length``, ``\$count``);` `    ``return` `\$length``;``}` `// Driver Code``\$a` `= ``array``( 8, 25, 10, 19, 19,``            ``18, 20, 11, 18 );``\$n` `= 9;``\$k` `= 13;` `echo` `longestSubarray(``\$a``, ``\$n``, ``\$k``);` `// This code is contributed``// by Arnab Kundu``?>`

## Javascript

 ``
Output:
`4`

Time Complexity: O(N)
Auxiliary Space: O(1)

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