Skip to main content

First Repeating Element | Easy | Techgig

First Repeating Element | Easy | Techgig

C++ Solution

First Repeating Element | Easy | Techgig

C++ Solution

The first repeating element is the problem that comes under the Linear Search problem under the Algorithm section.

Linear Search or sequential search is a method for finding an element within a list. The algorithm works by selecting and checking each number sequentially until matched. A linear search runs in at the worst linear time and makes at most n comparisons, where n is the length of the list. If each element is equally likely to be searched, then the sequential search has an average case of (n+1)/2 comparisons, but the average case can be affected if the search probabilities for each element vary. The complexity of the linear search is as follows:

The basic linear search algorithm has the following steps:

Given a list L on n elements with values L0…Ln-1, and target value T, to find the index of the target T in the list L.

  1. Set i to 0.
  2. If Li = T, the search terminates successfully; return i.
  3. Increase i by 1.
  4. If i < n, go to step 2. Otherwise, the search terminates unsuccessfully.

The question states that Given an array of integers, find the first repeating element in it. We need to find the number that occurs more than once and whose index of the first occurrence is smallest.

Input Format

A function with an integer array as arguments

Constraints

1 < N < 10⁵

1 < a[i] < 10⁵

Output Format

You need to return the first repeating element from the function.

Sample TestCase 1

Output

Time Limit(X): 1.00 sec(s) for each input.

Memory Limit: 512 MB

Source Limit: 100 KB

The below code suggest using two for loops, the first one to hold a value and the second one to iterate through the rest of the element.

The linear searching technique makes this much easier to understand for a beginner but there are ways to optimize this code. Can you try finding an optimized code for this problem?

Thank you for reading, have a delightful day.

Labels:

Comments

Post a Comment

Popular posts from this blog

How to use Chess com API using Python

  How to use Chess com API using Python Chess is an amazing strategy-based game and if you have been following the recent boom of online chess then welcome to the chess club. Online chess is amazing since it allows you to play with a random stranger at your level or stockfish (computer). There are many popular online chess websites like lichess.org, chess.com, playchess.com, and newly created kasparovchess.com. Today we will be seeing how to use chess.com API for getting players' stats. You can create software and get affiliates from them (check out the link below), so share it with them if you are planning to create something. Before you start make sure you have the following things: Pre-requirements Postman Anaconda or mini conda or Python idle Any text editor of your choice Pretty good? Now let’s download the JSON file that chess com developers have already made for us from here and then you import it to the Postman. This just helps you with prewritten get methods so that ...
Post a Comment
Read more

Create your own YouTube video and playlist downloader using QT designer in Python

Create your own YouTube video and playlist downloader using QT designer in Python The code for this software is available on my GitHub, the link is given below. Create your own YouTube video and playlist downloader using QT designer in Python This is the thing we are trying to make today for this article The code for this software is available on my GitHub, the link is given below. If you haven’t checked out my previous article on the same topic but not the GUI version, please check it out. 3 ways to download YouTube playlists at once using Python Have you guys ever wanted to download your entire youtube playlist? rahulbhatt1899.medium.com So before starting to code let's check if you have all the requirements beforehand: Pre-requirements : Qt designer Anaconda or mini conda or python 3.7 compiler Any text editor of your choice Libraries to download: Pytube Ffmpy PyQt5 This would be sectioned into the following structure: Creating the UI in Qt designer Converting UI file int...
Post a Comment
Read more

Authentication Using Passport JS

Authentication is big and most complicated part of an application, but it is also the  preponderance  part of any web app/software in general. Passport JS Passport JS is a widely popular authentication module for  Node js.  The sole purpose is to authenticate requests and is based on the idea of pluggable authentication strategies ( including local strategy, there are more than 500 strategies currently  available  ). When using third party application Your app never receives your password  thus freeing the developer from the burden of security related to handling and storing passwords. The Passport authentication and its strategy will include protection against attacks like “man in the middle” and other vectors an attacker might exploit. We are going to use Facebook strategy, for now, to install Passport and Facebook strategy type in the following command: Next, we are going to write the authentication code, and we’ll be creating a different module cal...
Post a Comment
Read more