topics.yaml

---
# See the contributing guidelines for details on the formatting here.
"25":
  title: "Binary Tree Zigzag Level Order Traversal"
  difficulty: "Medium"
  source: "Leetcode"
  body: |
    <strong>
      Binary Tree Traversal
    </strong>
    <br>
      Given the `root` of a binary tree, return the zigzag level
      order traversal of its nodes' values (i.e. from left to right,
      then right to left for the next level and alternate between).
    </br>
    <a
    href="https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/"
    target="_blank">
    🔗 Leetcode Link!</a>
  author_name: "Mario Carbonell"

"24":
  title: "How to Remove Array Duplicates in ES6"
  difficulty: "Beginner"
  source: "Medium - Daily JS"
  body: |
    <strong>
      3 easy ways to remove duplicates in arrays
    </strong>
    <br>
      Quick and easy!
    </br>
    <a href="https://bit.ly/3FtTPxb" target="_blank">
    🔗 Blog post Link!</a>
  author_name: "Samantha Ming"

"23":
  title: "How to Break Into the Tech Industry"
  difficulty: "Beginner"
  source: "haseebq.com"
  body: |
    <strong>
      This is a fantastic blog post by Haseeb Qureshi
    </strong>
    <br>
      How to break into tech job hunting and interviews
    </br>
    <a href="https://bit.ly/3tYwIFF" target="_blank">
    🔗 Blog post Link!</a>
  author_name: "Jesus Quezada"

"22":
  title: "Roman to integer"
  difficulty: "Beginner"
  source: "Leetcode"
  body: |
    <strong>Algorithm focused on string manipulation!</strong><br>
    Find the integer value of a given roman string. <br>
    Roman numerals are represented by symbols I, V, X, L, C, D and M.<br>
    Roman numerals are written largest to smallest from left to right.<br>
    However, 4 is not IIII. Instead, the number four is written as IV.<br>
    Same principle applies to the number 9, which is written as IX. <br>
    There are six instances where subtraction is used:<br>

    I can be placed before V (5) and X (10) to make 4 and 9. <br>
    X can be placed before L (50) and C (100) to make 40 and 90. <br>
    C can be placed before D (500) and M (1000) to make 400 and 900. <br>

    <br>
    <a href="https://leetcode.com/problems/roman-to-integer/"
    target="_blank">Leetcode challenge Link!</a>
  author_name: "Pedro Ramirez"

"21":
  title: "Even Fibonacci Numbers"
  difficulty: "Beginner"
  source: "ProjectEuler.net"
  body: |
    <strong>
      Problem 2 of Project Euler
    </strong>
    <br>
      Each new term in the Fibonacci sequence is generated
      by adding the previous two terms. By starting with 1
      and 2, the first 10 terms will be:
    </br>
    <br>
      1, 2, 3, 4, 8, 13, 21, 34, 55, 89, ...
    </br>
    <br>
      By considering the terms in the Fibonacci sequence
      whose values do not exceed four million (4000000),
      find the sum of the even-valued terms.
    </br>
    <a href="https://projecteuler.net/problem=2"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Mario Carbonell"

"20":
  title: "Sorting an array using insertion sort"
  difficulty: "Beginner"
  source: "pepcoding.com"
  body: |
    <strong>
      Problem that highlights the insertion sort algorithm.
    </strong>
    <br>
     Given an array of integers, sort it in an ascending order
     using insertion sort.
    </br>
    <a href="https://bit.ly/pepcoding-insertion-sort"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Davis Omokaro"

"19":
  title: "Valid Anagram"
  difficulty: "Beginner"
  source: "LeetCode"
  body: |
    <strong>
      This is a beginner problem involving strings,
      comparisons and hash tables.
    </strong>
    <br>
      Given two strings s and t, return true if
      t is an anagram of s, and false otherwise.
    </br>
    <a href="https://leetcode.com/problems/valid-anagram/"
    target="_blank"> 🔗 LeetCode - Valid Anagram</a>
  author_name: "Maeling Murphy"

"18":
  title: "Maximum Subarray"
  difficulty: "Beginner"
  source: "LeetCode"
  body: |
    <strong>
    This is an easy level problem that can be used
     to solve a lot of algorithms.
      It uses a pattern known as the 'Sliding Window' technique.
      Many algorithms in which you would implement a sliding window,
      uses words like 'sum','continous' or 'contigous'.
    </strong>
    <br>
      Given an integer array called nums, find the contiguous
      subarray (containing at least one number) which has the largest
      sum and return its sum.
    </br>
    <a href="https://leetcode.com/problems/maximum-subarray/"
    target="_blank"> 🔗 Leetcode - Max Subarray</a>
  author_name: "Dolly Desir"

"17":
  title: "JavaScript 3 FizzBuzz Solutions, Including the Shortest"
  difficulty: "Beginner"
  source: "Dev Genius"
  body: |
    <strong>
      Three ways to answer FizzBuzz using Javascript.
    </strong>
    <br>
     FizzBuzz is quite the popular coding question.
    </br>
    <br>
     If you haven't tried to tackle the problem then give this article a read!
    </br>
    <a href="https://tinyurl.com/hd3smmuk"
    target="_blank">🔗 FizzBuzz Solutions Link!</a>
  author_name: "Jadiva Montealegre"

"16":
  title: "Bubble Sort"
  difficulty: "Beginner"
  source: "Algorithms: Explained and Animated"
  body: |
    <strong>
      Video animations to illustrate how data moves during bubble sort.
    </strong>
    <br>
     Visualize bubble sort & other algorithms with free Android/iPhone apps.
    </br>
    <a href="https://www.youtube.com/watch?v=54fOXwu_5Es"
    target="_blank">🔗 Bubble Sort Visualization Link!</a>
  author_name: "Tiffany"

"15":
  title: "Multiples of 3 and 5"
  difficulty: "Beginner"
  source: "ProjectEuler.net"
  body: |
    <strong>
      This also is a beginner problem. It will allow you to think
      through the steps of a straightforward mathematical problem,
      and solve it in it's component steps.
    </strong>
    <br>
     Sum all the multiples of 3 or 5 below 1000.
    </br>
    <a href="https://projecteuler.net/problem=1"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Eamonn Cottrell"

"14":
  title: "Convert Age to Days"
  difficulty: "Beginner"
  source: "Edabit.com"
  body: |
    <strong>
      This is a beginner problem that works with conversion of different
       time measurements. This site is great for having very
        basic to more advanced problems of every topic.
    </strong>
    <br>
     Create a function that takes the age in years and returns the age in days.
    </br>
    <a href="https://edabit.com/challenge/bL7hSc6Zh4zZJzGmw"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Manon Sainton"

"13":
  title: "Sort Array By Parity"
  difficulty: "Beginner"
  source: "LeetCode"
  body: |
    <strong>
      Practice array manipulation with
       different problem solving approaches.
    </strong>
    <br>
     Given an integer array, move all the even integers
      at the beginning of the array followed by
      all the odd integers.
    <br>
    <a href="​​https://leetcode.com/problems/sort-array-by-parity/"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Kevin Minutti"

"12":
  title: "Binary Search"
  difficulty: "Beginner"
  source: "Binary Search"
  body: |
    <strong>
     Learn Algorithms Together
    </strong>
    <br>
      Join or create a room, invite your friends, and get ready to
       solve problems together.
     You'll all get the same coding question to solve.
     Only you can see your editor.
     Chat and solve questions together. Once you're done, you can
      browse other people's solutions.
    </br>
    <a href="https://binarysearch.com/"
    target="_blank">🔗 Binary Search Website!</a>
  author_name: "Hulya Karakaya"

"11":
  title: "How to Prepare for Technical Interviews"
  difficulty: "Beginner"
  source: "YouTube"
  body: |
    <strong>
      A very meaningful and pragmatic way of approaching leetcode problems
    </strong>
    <br>
      Follow this strategy to effectively prepare for your technical
       interviews!
    </br>
    <a href="https://www.youtube.com/watch?v=7UlslIXHNsw"
    target="_blank">🔗 How to Prepare for Technical Interviews Link!</a>
  author_name: "Amy Cai"

"10":
  title: "Sales by Match"
  difficulty: "Beginner"
  source: "Hacker Rank"
  body: |
    <strong>
      A fun and easy frequency counter problem
    </strong>
    <br>
      There is a large pile of socks that must be paired
      by color. Given an array of integers representing
      the color of each sock, determine how many pairs of
      socks with matching colors there are.
    </br>
    <a href="https://www.hackerrank.com/challenges/sock-merchant/problem"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Mario Carbonell"

"9":
  title: "Flexbox Learning Tool"
  difficulty: "Beginner"
  source: "Flexbox Defense"
  body: |
    <strong>
      This is a nice interactive game for
       learning how to use Flexbox in CSS.
    </strong>
    <br>
      Use Flexbox properties to move towers into the
       right defensive positions.
      This game can help one better understand how
       to effectively use and optimize
       CSS Flexbox styling.
    <br>
    <a href="https://http://www.flexboxdefense.com/"
    target="_blank">🔗 CSS Flexbox Tower Defense Game!</a>
  author_name: "Johnathan Raiss"
"8":
  title: "Single Number"
  difficulty: "Beginner"
  source: "Leetcode"
  body: |
    <strong>
      A great easy problem to practice sorting!
    </strong>
    <br>
      Given a non-empty array of integers nums,
        every element appears twice except for one.
      Find that single one.<br>
    <br>
    <a href="https://leetcode.com/problems/single-number/"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Kirill Grinash"

"7":
  title: "1000-digit Fibonacci Number"
  difficulty: "Beginner"
  source: "ProjectEuler"
  body: |
    <strong>
      This is a great problem for developing mathematical understanding while
       solving a programming question.
    </strong>
    <br>
      Find the index of first 1000 digit fibonacci number.
    <br>
    <a href="https://projecteuler.net/problem=25"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Sourav Singh Rawat"

"6":
  title: "Palindrome Linked List"
  difficulty: "Beginner"
  source: "LeetCode"
  body: |
    <strong>
      This is an excellent introduction to linked lists!
    </strong>
    <br>
      Given the head of a singly linked list, return true if it is a palindrome.
    <br>
    <a href="https://leetcode.com/problems/palindrome-linked-list/"
    target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Jesse Smith"

"5":
  title: "Tutorial for Interview Prep"
  difficulty: "Beginner"
  source: "PassMyInterview"
  body: |
    <strong>
      This is a brilliant training tutorial to pass any job
       interview in one attempt!
    </strong>
    <br>
      If you have any any job interview coming up, make sure
       you study this brilliant
       training tutorial from start to finish!
      It is guaranteed to help you PASS your interview!
      This resource has helped countless number of persons from all
       fields ace their interview.<br>
    <br>
    <a href="https://passmyinterview.com/top-30-interview-questions-answers/"
     target="_blank">🔗 TOP 30 INTERVIEW QUESTIONS and Answers</a>
  author_name: "Anita Ihuman"

"4":
  title: "Valid Parentheses"
  difficulty: "Beginner"
  source: "LeetCode"
  body: |
    <strong>
      This is a great introduction to the Stack data structure!
    </strong>
    <br>
      Given a string s containing just the characters '(', ')', ' {', '}',
       '[' and ']', determine if the input string is   valid.
    <br>
      An input string is valid if:
      Open brackets must be closed by the same type of brackets.
      Open brackets must be closed in the correct order. <br>
    <br>
    <a href="https://leetcode.com/problems/valid-parentheses/"
     target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Jesus Quezada"

"3":
  title: "Number of Islands"
  difficulty: "Medium"
  source: "LeetCode"
  body: |
    <strong>This is a good problem for learning graph traversal!</strong><br>
    Given an m x n 2D binary grid grid which represents a map of '1's (land)
     and '0's (water), return the number of islands. <br>
    An island is surrounded by water and is formed by connecting adjacent
     lands horizontally or vertically. You may assume all four edges of
      the grid are all surrounded by water. <br>
    <br>
    <a href="https://leetcode.com/problems/number-of-islands/"
     target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Trevor"

"2":
  title: "Common Prefix Problem"
  difficulty: "Beginner"
  source: "Leetcode"
  body: |
    <strong>This link is a great beginner-level algorithm focused
     on strings!</strong><br>
    Write a function to find the longest common prefix string amongst
     an array of strings. <br>
    If there is no common prefix, return an empty string "".<br>
    <br>
    <a href="https://leetcode.com/problems/longest-common-prefix/"
     target="_blank">🔗 Code Challenge Link!</a>
  author_name: "Kristal"

"1":
  title: "Quarter  of the Year"
  difficulty: "Beginner"
  source: "Codewars"
  body: |
    Given a month as an integer from 1 to 12, return to which quarter
     of the year it belongs as an integer number. <br>
    For example: month 2 (February), is part of the first quarter; month
     6 (June), is part of the second quarter; and month 11 (November),
      is part of the fourth quarter.<br>
    <br>
    <a
     href="https://www.codewars.com/kata/5ce9c1000bab0b001134f5af/train/python"
     target="_blank">🔗 Code Challenge Link!</a>