Two Sum | Blind 75 #1 — Fast O(n) HashMap Solution (Python)
Автор: CodeXPlain
Загружено: 2025-11-29
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Two Sum — Blind 75 Problem #1 (Python Solution)
In this video, we solve the famous LeetCode “Two Sum” problem using a clean and optimal O(n) HashMap approach. This is the first problem in the Blind 75 series, and a must-know pattern for coding interviews.
🧠 What you’ll learn:
• Full problem explanation
• Example walkthrough
• Why brute force is O(n²)
• The O(n) one-pass HashMap trick
• Python implementation explained step by step
📌 Problem:
Given an array nums and an integer target, return indices i and j such that nums[i] + nums[j] == target.
Examples:
nums = [3,4,5,6], target = 7 → [0,1]
nums = [5,5], target = 10 → [0,1]
📌 Final Insight:
Use a dictionary to store values and check if (target - current) exists.
🔗 Full Blind 75 Playlist:
• Blind 75 Python Solutions (LeetCode + Neet...
If this helped, please like 👍 and Subscribe for the full Blind 75 Python series.
#python #leetcode #dsa #twosum #blind75 #codinginterview #neetcode
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