TOP INTERVIEW QUESTIONS

Easy Level Collection

1. Array

• Remove Duplicates from Sorted Array - Cpp Solution
• Best Time to Buy and Sell Stock - Cpp Solution
• Best Time to Buy and Sell Stock II - Cpp Solution
• Rotate Array - Cpp Solution
• Contains Duplicate - Cpp Solution
• Single Number - Cpp Solution
• Intersection of Two Arrays II - Cpp Solution
• Plus One - Cpp Solution
• Move Zeroes - Cpp Solution
• Two Sum - Cpp Solution
• Valid Sudoku - Cpp Solution
• Rotate Image - Cpp Solution
• Max-Increase-to-keep-city-skyline - C++ Solution
• Subrectangle Queries - C++ Solutoin
• Minimum Number Of Operations to Move Balls to Each Box - C++ Solution
• Group People By Group Size - C++ Solution
• Summary Ranges - C++ Solution
• Next Permutation - C++ Solution
• Sliding Window Maximum - C++ Solution

2. Strings

• Reverse String - Cpp Solution
• First Unique Character in a String - Cpp Solution
• Valid Anagram - Cpp Solution
• Valid Palindrome - Cpp Solution
• String to Integer (atoi) - Cpp Solution
• Implement strStr() - Cpp Solution
• Longest Common Prefix - Cpp Solution

3. Linked List

• Delete Node in a Linked List - Cpp Solution
• Remove Nth Node From End of List - Cpp Solution
• Reverse Linked List - Cpp Solution
• Merge Two Sorted Lists - Cpp Solution
• Palindrome Linked List - Cpp Solution
• Linked List Cycle - Cpp Solution
• Linked List Cycle II - Cpp Solution

4. Trees

• Maximum Depth of Binary Tree - Cpp Solution
• Validate Binary Search Tree - Cpp Solution
• Symmetric Tree - Cpp Solution
• Binary Tree Level Order Traversal - Cpp Solution
• Convert Sorted Array to Binary Search Tree - Cpp Solution

5. Sorting and Searching

• Merge Sorted Array - Cpp Solution
• First Bad Version - Cpp Solution

6. Dynamic Programming

• Climbing Stairs - Cpp Solution
• Best Time to Buy and Sell Stock - Cpp Solution
• Maximum Subarray - Cpp Solution
• House Robber - Cpp Solution
• Longest Common Subsequence - Cpp Solution

7. Design

• Shuffle an Array - Cpp Solution
• Min Stack - Cpp Solution

8. Math

• Fizz Buzz - Cpp Solution
• Count Primes - Cpp Solution
• Power of Three - Cpp Solution
• Power of Four - Cpp Solution
• Roman to Integer - Cpp Solution

9. Others

• Number of 1 Bits - Cpp Solution
• Hamming Distance - Cpp Solution
• Reverse Bits - Cpp Solution
• Pascal’s Triangle - Cpp Solution
• Valid Parentheses - Cpp Solution
• Missing Number - Cpp Solution

Medium Level Collection

1. Array

• 4Sum - Cpp Solution
• 3Sum - Cpp Solution
• Set Matrix Zeroes - Cpp Solution
• Group Anagrams - Cpp Solution
• Longest Substring Without Repeating Characters - Cpp Solution
• Longest Palindromic Substring - Cpp Solution
• Increasing Triplet Subsequence - Cpp Solution

2. Linked List

• Add Two Numbers - Cpp Solution
• Odd Even Linked List - Cpp Solution
• Intersection of Two Linked Lists - Cpp Solution

3. Trees & Graphs

• Binary Tree Inorder Traversal - Cpp Solution
• Binary Tree Zigzag Level Order Traversal - Cpp Solution
• Construct Binary Tree from Preorder and Inorder Traversal - Cpp Solution
• Populating Next Right Pointers in Each Node - Cpp Solution
• Kth Smallest Element in a BST - Cpp Solution
• Number of Islands - Cpp Solution
• Minimum Number of Vertices to Reach All Nodes - Cpp Solution

4. Backtracking

• Letter Combinations of a Phone Number - Cpp Solution
• Generate Parentheses - Cpp Solution
• Permutations - Cpp Solution
• Permutations II - Cpp Solution
• Subsets - Cpp Solution
• Word Search - Cpp Solution

5. Sorting and Searching

• Sort Colors - Cpp Solution
• Top K Frequent Elements - Cpp Solution
• Kth Largest Element in an Array - Cpp Solution
• Find Peak Element - Cpp Solution
• Search for a Range - Cpp Solution
• Merge Intervals - Cpp Solution
• Search in Rotated Sorted Array - Cpp Solution
• Search a 2D Matrix II - Cpp Solution
• Find First and Last Position of Element in Sorted Array - Cpp Solution

6. Dynamic Programming

• Jump Game - Cpp Solution
• Unique Paths - Cpp Solution
• Coin Change - Cpp Solution
• Longest Increasing Subsequence - Cpp Solution
• Word Break - Cpp Solution
• Super Egg Drop - Cpp Solution

7. Design

• Serialize and Deserialize Binary Tree - Cpp Solution
• Insert Delete GetRandom O(1) - Cpp Solution

8. Math

• Happy Number - Cpp Solution
• Factorial Trailing Zeroes - Cpp Solution
• Excel Sheet Column Number - Cpp Solution
• Pow(x, n) - Cpp Solution
• Sqrt(x) - Cpp Solution
• Divide Two Integers - Cpp Solution
• Fraction to Recurring Decimal - Cpp Solution

9. Others

• Sum of Two Integers - Cpp Solution
• Evaluate Reverse Polish Notation - Cpp Solution
• Majority Element - Cpp Solution
• Majority Element II - Cpp Solution
• Task Scheduler - Cpp Solution
• ZigZag Conversion - Cpp Solution
• Repeated DNA Sequences - Cpp Solution

Hard Level Collection

1. Array

• Product of Array Except Self - Cpp Solution
• Minimum Number of Days to Eat N Oranges - Cpp Solution
• First Missing Positive - Cpp Solution
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2. Dynamic Programming

• Trapping Rain Water - Cpp Solution