Delete an Element from the end of an array

Last Updated : 08 Nov, 2024

Given an array of integers, the task is to delete an element from the end of the array.

Examples:

Input: arr[] = [10, 20, 30, 40]
Output: [10, 20, 30]
Input: arr[] = [20]
Output: []

Table of Content

[Approach 1] Using Built-In Methods
[Approach 2] Using Custom Method

[Approach 1] Using Built-In Methods

We will use library methods like pop_back() in C++, remove() in Java, pop() in Python and JavaScript and removeAt() in C#.

C++

// C++ program to delete an element from the end 
// of an array using in-built methods

#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<int> arr = { 10, 20, 30, 40 };
  
    cout << "Array before deletion\n";
    for (int i = 0; i < arr.size(); i++)
        cout << arr[i] << " ";
  	
    // Remove the last element from the array
    arr.pop_back();

    cout << "\nArray after deletion\n";
    for (int i = 0; i < arr.size(); i++)
        cout << arr[i] << " ";

    return 0;
}

Java

// Java program to delete an element from the end of an array
// using in-built methods

import java.util.*;

class GfG {
    public static void main(String[] args) {
        ArrayList<Integer> arr = new ArrayList<>
          						(Arrays.asList(10, 20, 30, 40));

        System.out.println("Array before deletion");
        for (int ele : arr) 
            System.out.print(ele + " ");

        // Remove the last element from the array
        arr.remove(arr.size() - 1);

        System.out.println("\nArray after deletion");
        for (int ele : arr) 
            System.out.print(ele + " ");
    }
}

Python

# Python program to delete an element from the end 
# of an array using in-built methods

arr = [10, 20, 30, 40]

print("Array before deletion")
for ele in arr:
    print(ele, end=" ")

# Remove the last element from the array
arr.pop()

print("\nArray after deletion")
for ele in arr:
    print(ele, end=" ")

// C# program to delete an element from the end 
// of an array using in-built methods

using System;
using System.Collections.Generic;

class GfG {
    static void Main() {
        List<int> arr = new List<int> { 10, 20, 30, 40 };

        Console.WriteLine("Array before deletion");
        foreach (var ele in arr) 
            Console.Write(ele + " ");

        // Remove the last element from the array
        arr.RemoveAt(arr.Count - 1);

        Console.WriteLine("\nArray after deletion");
        foreach (var ele in arr) 
            Console.Write(ele + " ");
    }
}

JavaScript

// JavaScript program to delete an element from the end 
// of an array using in-built methods

let arr = [10, 20, 30, 40];

console.log("Array before deletion");
console.log(arr);

// Remove the last element from the array
arr.pop();

console.log("Array after deletion");
console.log(arr);

Output

Array before deletion
10 20 30 40 
Array after deletion
10 20 30

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

[Approach 2] Using Custom Method

To delete an element from the end of an array, we can simply reduce the size of array by 1.

C++

// C++ program to delete an element from the end 
// of an array using custom methods

#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<int> arr = { 10, 20, 30, 40 };
    int n = arr.size();
  
    cout << "Array before deletion\n";
    for (int i = 0; i < n; i++)
        cout << arr[i] << " ";
  	
    // Reduce the array size by 1
    n--;

    cout << "\nArray after deletion\n";
    for (int i = 0; i < n; i++)
        cout << arr[i] << " ";

    return 0;
}

// C program to delete an element from the end 
// of an array using custom methods

#include <stdio.h>

int main() {
    int arr[] = { 10, 20, 30, 40 };
    int n = sizeof(arr)/sizeof(arr[0]);
  
    printf("Array before deletion\n");
    for (int i = 0; i < n; i++)
        printf("%d ", arr[i]);
    
    // Reduce the array size by 1
    n--;

    printf("\nArray after deletion\n");
    for (int i = 0; i < n; i++)
        printf("%d ", arr[i]);

    return 0;
}

Java

// Java program to delete an element from the end 
// of an array using custom methods

class GfG {
    public static void main(String[] args) {
        int[] arr = { 10, 20, 30, 40 };
        int n = arr.length;
  
        System.out.println("Array before deletion");
        for (int i = 0; i < n; i++)
            System.out.print(arr[i] + " ");
        
        // Reduce the array size by 1
        n--;

        System.out.println("\nArray after deletion");
        for (int i = 0; i < n; i++)
            System.out.print(arr[i] + " ");
    }
}

Python

# Python program to delete an element from the end 
# of an array using custom methods

if __name__ == "__main__":
    arr = [10, 20, 30, 40]
    n = len(arr)
  
    print("Array before deletion")
    for i in range(n):
        print(arr[i], end=" ")
    
    # Reduce the array size by 1
    n -= 1

    print("\nArray after deletion")
    for i in range(n):
        print(arr[i], end=" ")

// C# program to delete an element from the end 
// of an array using custom methods

using System;

class GfG {
    static void Main() {
        int[] arr = { 10, 20, 30, 40 };
        int n = arr.Length;
  
        Console.WriteLine("Array before deletion");
        for (int i = 0; i < n; i++)
            Console.Write(arr[i] + " ");
        
        // Reduce the array size by 1
        n--;

        Console.WriteLine("\nArray after deletion");
        for (int i = 0; i < n; i++)
            Console.Write(arr[i] + " ");
    }
}

JavaScript

// JavaScript program to delete an element from the end
// of an array using custom methods

let arr = [ 10, 20, 30, 40 ];
let n = arr.length;

console.log("Array before deletion");
for (let i = 0; i < n; i++) {
    console.log(arr[i]);
}

// Reduce the array size by 1
n--;

console.log("\nArray after deletion");
for (let i = 0; i < n; i++) {
    console.log(arr[i]);
}

Output

Array before deletion
10 20 30 40 
Array after deletion
10 20 30

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

Delete an Element from the Beginning of an Array

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Delete an Element from the end of an array

[Approach 1] Using Built-In Methods

[Approach 2] Using Custom Method

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