💻 Interview Prep

Coding Interview Problems
Solved in Python, C & JavaScript

Step-by-step visual explanations and clean code for the most commonly asked coding interview problems, with time and space complexity analysis.

10
Problems Solved
3
Languages per Problem
O(n)
Optimal Complexity
Arrays & Hashing 1
Easy ⭐ #1 Most Searched
Two Sum — O(n) Hash Map Solution (Python, C, JavaScript)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n)
SpaceO(n)
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Stack 1
Easy ⭐ Classic Interview
Valid Parentheses — Stack Solution (Python, C, JavaScript)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n)
SpaceO(n)
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Linked Lists 2
Easy ⭐ Core Data Structure
Reverse a Linked List — Iterative & Recursive (Python, C, JS)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n)
SpaceO(1)
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Easy ⭐ Standard Interview
Merge Two Sorted Linked Lists — Dummy Node Technique (Python, C, JS)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n + m)
SpaceO(1)
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Greedy / Two Pointers 1
Easy ⭐ Top Interview
Best Time to Buy and Sell Stock — O(n) One-Pass Solution
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n)
SpaceO(1)
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Dynamic Programming 1
Medium ⭐ Classic Algorithm
Maximum Subarray — Kadane's Algorithm Explained (Python, C, JS)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n)
SpaceO(1)
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Searching 1
Easy ⭐ Core Computer Science
Binary Search — O(log n) Implementation in Python, C & JavaScript
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(log n)
SpaceO(1)
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Trees 1
Easy ⭐ Viral Interview Question
Invert a Binary Tree — Recursive & BFS Solution (Python, C, JS)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n)
SpaceO(h) recursion stack
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Basic Logic 1
Easy ⭐ Universal Screening
FizzBuzz Solution in Python, C & JavaScript (Clean & Extensible)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(n)
SpaceO(n) output
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Math 1
Easy ⭐ Popular Interview
Palindrome Number Without String Conversion (Python, C, JS)
🐍 Python ⚙️ C 🌐 JavaScript
TimeO(log n)
SpaceO(1)
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