LeetCode Problem #1: Two Sum | Complete Solution Explanation | Coding Challenge Day 1/40
Welcome to Day 1 of my 40-day coding challenge! 🚀
In this video, I solve LeetCode Problem #1: Two Sum – one of the most famous coding interview questions. I explain the problem statement, walk through the logic, and provide a complete solution.
🔗 Problem Link: https://leetcode.com/problems/two-sum/
📝 Problem Statement:
Given an array of integers nums and an integer target, return the indices of the two numbers that add up to the target.
🧠 What You'll Learn:
✅ Understanding the Two Sum problem
✅ Brute force approach (O(n²))
✅ Optimized solution using Hash Map (O(n))
✅ Step-by-step code explanation
✅ Time & Space complexity analysis
💻 Solution Approaches Covered:
Approach Time Complexity Space Complexity
Brute Force O(n²) O(1)
Hash Map (Optimal) O(n) O(n)
🎯 Example:
text
Input: nums = [2,7,11,15], target = 9
Output: [0,1]
Explanation: nums[0] + nums[1] = 2 + 7 = 9
📚 This is Part of My 40-Day Coding Challenge:
Day 1: Two Sum ✅
Day 2: Coming soon...
Day 3: Coming soon...
📫 Connect with Me:
LinkedIn: / raunak-shahu-9308a83a1
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GitHub: https://github.com/raunak2015
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