In this video, we solve **LeetCode 1169 – Invalid Transactions** step by step.
We break down the problem statement, identify the key conditions that make a transaction invalid, and then implement a clean and efficient solution. This problem is a great example of how careful problem analysis and data structuring can simplify seemingly complex logic.
📌 What you’ll learn:
- How to interpret real-world constraints in coding problems
- How to group and compare transactions efficiently
- Common pitfalls to avoid in LeetCode string-parsing problems
- Writing clean and readable logic for interview-style questions
🧠 Problem Overview:
A transaction is invalid if:
- The amount exceeds $1000, or
- The same person makes another transaction in a different city within 60 minutes
🔧 Topics Covered:
- Hash maps
- String parsing
- Iteration and comparison logic
💻 Difficulty:
Medium
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🔗 LeetCode Problem Link:
https://leetcode.com/problems/invalid-transactions/
#leetcode #codinginterview #dsa #algorithms #programming #softwareengineering
