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Elements greater than the previous and next element in an Array

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  • Difficulty Level : Easy
  • Last Updated : 08 Mar, 2022
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Given an array of N integers. The task is to print the elements from the array which are greater than their immediate previous and next elements.
Examples
 

Input : arr[] = {2, 3, 1, 5, 4, 9, 8, 7, 5}
Output : 3, 5, 9
In above given example 3 is greater than its 
left element 2 and right element 1. 
Similar logic is applied to other elements 
hence our final output is 3, 5, 9.

Input : arr[] = {1, 2, 3, 2, 1}
Output : 3

 

Approach: Since there is no element on the left of the first element(arr[0]) and there is no element to the right of last element(arr[N-1]) so these two elements will be excluded from the final answer.
Now, traverse the array starting from the index 1 to N-2 and for every element arr[i] check if arr[i] > arr[i-1] and arr[i] > arr[i+1].
Below is the implementation of the above approach: 
 

C++




// C++ program to print elements greater than
// the previous and next element in an Array
#include <bits/stdc++.h>
using namespace std;
 
// Function to print elements greater than
// the previous and next element in an Array
void printElements(int arr[], int n)
{
    // Traverse array from index 1 to n-2
    // and check for the given condition
    for (int i = 1; i < n - 1; i++) {
        if (arr[i] > arr[i - 1] and arr[i] > arr[i + 1])
            cout << arr[i] << " ";
    }
}
 
// Driver Code
int main()
{
    int arr[] = { 2, 3, 1, 5, 4, 9, 8, 7, 5 };
    int n = sizeof(arr) / sizeof(arr[0]);
 
    printElements(arr, n);
 
    return 0;
}

Java




// Java program to print elements greater than
// the previous and next element in an Array
class GfG
{
 
// Function to print elements greater than
// the previous and next element in an Array
static void printElements(int arr[], int n)
{
    // Traverse array from index 1 to n-2
    // and check for the given condition
    for (int i = 1; i < n - 1; i++)
    {
        if (arr[i] > arr[i - 1] && arr[i] > arr[i + 1])
            System.out.print(arr[i] + " ");
    }
}
 
// Driver Code
public static void main(String[] args)
{
    int arr[] = { 2, 3, 1, 5, 4, 9, 8, 7, 5 };
    int n = arr.length;
 
    printElements(arr, n);
}
}
 
// This code is contributed by Prerna Saini

Python3




# Python 3 program to print elements greater than
# the previous and next element in an Array
 
# Function to print elements greater than
# the previous and next element in an Array
def printElements(arr, n):
     
    # Traverse array from index 1 to n-2
    # and check for the given condition
    for i in range(1, n - 1, 1):
        if (arr[i] > arr[i - 1] and
            arr[i] > arr[i + 1]):
            print(arr[i], end = " ")
 
# Driver Code
if __name__ == '__main__':
    arr = [2, 3, 1, 5, 4, 9, 8, 7, 5]
    n = len(arr)
 
    printElements(arr, n)
     
# This code is contributed by
# Surendra_Gangwar

C#




using System;
 
// c# program to print elements greater than
// the previous and next element in an Array
public class GfG
{
 
// Function to print elements greater than
// the previous and next element in an Array
public static void printElements(int[] arr, int n)
{
    // Traverse array from index 1 to n-2
    // and check for the given condition
    for (int i = 1; i < n - 1; i++)
    {
        if (arr[i] > arr[i - 1] && arr[i] > arr[i + 1])
        {
            Console.Write(arr[i] + " ");
        }
    }
}
 
// Driver Code
public static void Main(string[] args)
{
    int[] arr = new int[] {2, 3, 1, 5, 4, 9, 8, 7, 5};
    int n = arr.Length;
 
    printElements(arr, n);
}
}

PHP




<?php
// PHP program to print elements greater than
// the previous and next element in an Array
 
// Function to print elements greater than
// the previous and next element in an Array
function printElements($arr, $n)
{
    // Traverse array from index 1 to n-2
    // and check for the given condition
    for ($i = 1; $i < $n - 1; $i++)
    {
        if ($arr[$i] > $arr[$i - 1] and
            $arr[$i] > $arr[$i + 1])
            echo $arr[$i] . " ";
    }
}
 
// Driver Code
$arr = array(2, 3, 1, 5, 4, 9, 8, 7, 5);
$n = sizeof($arr);
 
printElements($arr, $n);
 
// This code is contributed
// by Akanksha Rai

Javascript




<script>
 
// Javascript implementation of the approach
 
// Function to print elements greater than
// the previous and next element in an Array
function printElements(arr,  n)
{
    // Traverse array from index 1 to n-2
    // and check for the given condition
    for (var i = 1; i < n - 1; i++) {
        if (arr[i] > arr[i - 1] && arr[i] > arr[i + 1])
            document.write( arr[i] + " ");
    }
}
var arr = [ 2, 3, 1, 5, 4, 9, 8, 7, 5 ];
var n = arr.length;
 
printElements(arr, n);
 
// This code is contributed by SoumikMondal
 
</script>

Output: 

3 5 9

 

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


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