Top notch resource to learn about the time complexity analysis of an algorithm l, a youtube playlist.

Print the elements of an array in reverse order in C++

Problem Statement Given an array, print its elements in reverse order. Note: We are not allowed to change the structure of the array For example: Input: {1,2,44,33} Output: {33,44,2,1} Input: {99,11,33,88} Output: {88,33,11,99} Solution Pretty easy problem, we will see all the different ways to solve it. Approach 1 – Backward looping The most obvious…

https://thecodingbot.com/print-the-elements-of-an-array-in-reverse-order-in-c/

Deleting a linked list in C++

Problem Statement Given a linked list, write a program to delete it. For Example Input: 2->4->6->9->NULL *After the Deletion* Output: The Linked List is Empty. Overview Before moving forward, it is necessary to clarify what we actually mean by deletion of the linked list. By deletion, we don’t mean to point the head of the…

https://thecodingbot.com/deleting-a-linked-list-in-c/

Amazing channel to learn C++. Videos uploaded weekly. From advanced concepts to best practices. A channel you should must check.

Where to learn data science from?

Blogs: kdnuggets.com, machinelearningmastery.com, kaggleblogs, Data Science Central(https://www.datasciencecentral.com), analytics vidhya blog(https://www.analyticsvidhya.com/blog/), fastml(fastml.com,very advanced sometimes).

Books: Python machine learning, Introduction to statistical learning, Elements of Statistical learning(order according to the difficulty).

Practice: analytics vidhya, kaggle, crowdanalytix, hackerrank(sometimes the competitions are held), hackerearth(few data science competitions).

Youtubechannel: Data School, Sentdex, ML trainings.

MOOCs: How to win a kaggle competition(coursera)[RECOMMENDED], Machine Learning by andrew ng(coursera), deeplearning(specialization) on by deeplearning.ai(coursera).

Datasets: Kaggle Datasets(https://www.kaggle.com/datasets), https://lionbridge.ai/datasets/the-50-best-free-datasets-for-machine-learning/, UCI Machine Learning Repo(https://archive.ics.uci.edu/ml/index.php)

LeetCode – 461. Hamming Distance

Problem Statement The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calculate the Hamming distance. Note: 0 ≤ x, y < 2^31. For Example Input: x = 1, y = 4 Output: 2 Explanation: 1   (0 0 0 1) 4  …

https://thecodingbot.com/leetcode-461-hamming-distance/

Today's topic is Automation with Python. You can do many cool stuffs like spamming your friend's inbox, wishing your friend, replying to the posts on facebook wall etc.

Here are some resources from where you can learn automation in Python.

Opensource github projects:

1. https://github.com/ShivajiReddy/WhatsApp-Using-Python (Easy)
2. https://github.com/umangahuja1/Youtube/tree/master/Whatsapp%20Automation
2. https://github.com/draguve/WhatsSpam (Easy)
3. https://github.com/shauryauppal/PyWhatsapp (Slightly advanced)

Youtube tutorial:

1. https://www.youtube.com/watch?v=5hr0IdVM7Qg
2. https://www.youtube.com/watch?v=98OewpG8-yw

Documentation of the libraries you are most likely going to use in above projects:

1. Requests: https://requests.readthedocs.io/en/master/
2. Selenium: https://selenium.dev/documentation/en/

Happy Coding (thecodingbot.com,t.me/thecodingbotdaily)

Printing the elements of a vector in reverse order

Problem Statement Given a vector, print its elements in reverse order. Note: We are not allowed to change the structure of the vector. For example: Input: {1,2,44,33} Output: {33,44,2,1} Input: {99,11,33,88} Output: {88,33,11,99} Solution In this tutorial, we will see different ways to print the vector in reverse order. Approach 1 – Backward looping The most obvious approach is to…

https://thecodingbot.com/printing-the-elements-of-a-vector-in-reverse-order/

It's sunday and we talk about miscellaneous stuff today.
Today's topic is C++ best practices.

Here are the top resources for your learning:

Books:

1. Cpp best practices(https://lefticus.gitbooks.io/cpp-best-practices/)[Intermediate-Advanced],
2. C++ notes for professional, 600+ pages of tricks and tips for developer(https://books.goalkicker.com/CPlusPlusBook/)

Youtube:

1.Jason Turner (https://www.youtube.com/user/lefticus1)
2.CppCon (https://www.youtube.com/user/CppCon)

If you don't know c++ and want to start fresh:

1.C++ 10 hours course!!!: https://www.youtube.com/watch?v=_bYFu9mBnr4&list=PL_c9BZzLwBRJVJsIfe97ey45V4LP_HXiG (Tip: To find the contents, scroll down to comment section)

2.Freecodecamp 4 hour beginner tutorial: https://www.youtube.com/watch?v=vLnPwxZdW4Y

3.The newboston c++ playlist: https://www.youtube.com/watch?v=tvC1WCdV1XU&list=PLAE85DE8440AA6B83

4.The cherno's youtube playlist : https://www.youtube.com/watch?v=18c3MTX0PK0&list=PLlrATfBNZ98dudnM48yfGUldqGD0S4FFb

Open source github projects:

1.VLC, built completely on c++ : https://github.com/videolan/vlc
2.Tenserflow, built using c++ : https://github.com/tensorflow/tensorflow
3.Electron framework for cross platform desktop application is built on the top of c++: https://github.com/electron/electron

Note: The open source projects are really advanced and it is not expected that an indivdual can implement one like them easily. Please just refer them for best coding practices and other learnings.

Happy coding(thecodingbot.com,t.me/thecodingbotdaily)

Insert a node in a sorted linked list

Problem Statement Given a sorted linked list and a node, insert the node in the linked list such that the linked list still remain sorted. For Example Input: 2 -> 8 -> 12 -> 41 ->NULL, val = 30 Output: 2 -> 8 -> 12 -> 30 ->41 -> NULL. Solutions Approach 1: Iterative Approach…

https://thecodingbot.com/insert-a-node-in-a-sorted-linked-list/

Today is Monday and we talk about machine learning.

Here are some good research papers/blogs that will help you to understand different parts of machine learning better:

Data Cleaning:

1. https://towardsdatascience.com/the-art-of-cleaning-your-data-b713dbd49726

2. https://www.dataquest.io/blog/machine-learning-preparing-data/

3. Missing data treatement: https://www.kaggle.com/rtatman/data-cleaning-challenge-handling-missing-values

4. Quick guide on how to clean data(beginners): https://www.analyticsvidhya.com/blog/2015/06/quick-guide-text-data-cleaning-python/

Algorithm selection:

1. Slightly advance: https://hackernoon.com/choosing-the-right-machine-learning-algorithm-68126944ce1f

2. Valueable Discussion on kaggle: https://www.kaggle.com/getting-started/26947

3. Cheatsheet from Microsoft: http://download.microsoft.com/download/A/6/1/A613E11E-8F9C-424A-B99D-65344785C288/microsoft-machine-learning-algorithm-cheat-sheet-v6.pdf

4. Pros and Cons for each ML Algorithm(helps us to decide better Algorithm for our dataset):https://elitedatascience.com/machine-learning-algorithms

Hyper Parameter tuning:

1. https://www.jeremyjordan.me/hyperparameter-tuning/

2. https://www.datacamp.com/community/tutorials/parameter-optimization-machine-learning-models

3. Pretty decent guide: https://www.kaggle.com/willkoehrsen/intro-to-model-tuning-grid-and-random-search

4. Optimizing Hyper parameters: https://www.kaggle.com/c/santander-customer-transaction-prediction/discussion/89320

Exploratory Data Analysis:

1. https://www.kaggle.com/anokas/exploratory-data-analysis-4

2. Follow all the kernels from this guy : https://www.kaggle.com/anokas

A guide for almost all ML problems, steps from start till end:

http://blog.kaggle.com/2016/07/21/approaching-almost-any-machine-learning-problem-abhishek-thakur/


Happy Machine Learning(thecodingbot.com, t.me/thecodingbotdaily)

Finding the majority element in an array

Problem Statement Given an array of size n, find the majority element. What is the majority element in an array? The majority element is the element that occurs more than half of the size of the array i.e the element should occur more than (⌊ N/2 ⌋) times. You may assume that the array is non-empty…

https://thecodingbot.com/finding-the-majority-element-in-an-array/

Leetcode – 169. Majority Element

Problem Statement Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the array is non-empty and the majority element always exist in the array. Example 1: Input: [3,2,3] Output: 3 Example 2: Input: [2,2,1,1,1,2,2] Output: 2 (you can solve the…

https://thecodingbot.com/leetcode-169-majority-element/

How to customize Django admin panel cookbook

LeetCode – 182. Duplicate Emails

Write a SQL query to find all duplicate emails in a table named Person. +----+---------+ | Id | Email | +----+---------+ | 1 | a@b.com | | 2 | c@d.com | | 3 | a@b.com | +----+---------+ For example, your query should return the following for the above table: +---------+ | Email | +---------+ | a@b.com…

https://thecodingbot.com/leetcode-182-duplicate-emails/

LeetCode – 595. Big Countries

Problem Statement There is a table World +-----------------+------------+------------+--------------+---------------+ | name | continent | area | population | gdp | +-----------------+------------+------------+--------------+---------------+ | Afghanistan | Asia | 652230 | 25500100 | 20343000 | | Albania | Europe | 28748 | 2831741 | 12960000 | | Algeria | Africa | 2381741 | 37100000 | 188681000 | | Andorra |…

https://thecodingbot.com/leetcode-595-big-countries/

LeetCode – 627. Swap Salary

Problem Statement Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f values to m and vice versa) with a single update…

https://thecodingbot.com/leetcode-627-swap-salary/

LeetCode – 620. Not Boring Movies

Problem Statement X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a poster indicating the movies’ ratings and descriptions. Please write a SQL query…

https://thecodingbot.com/leetcode-620-not-boring-movies/