1394. Find Lucky Integer in an Array | Leetcode Daily - Python

Published: 04 July 2025
on channel: Leetcode Daily

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Ready to get lucky? 🍀 In this LeetCode tutorial, we solve problem 1394, "Find Lucky Integer in an Array". We'll define what a "lucky integer" is (a number whose count in an array matches its value) and walk through a clear example to make sure the logic is crystal clear.

Discover two powerful Python methods to solve this problem:
1️⃣ The classic Hash Map approach using Python's `collections.Counter` – a must-know pattern for counting frequencies efficiently.
2️⃣ A clever, optimized solution using a simple array as a frequency map, taking advantage of the problem's constraints (numbers 1-500) for a clean and fast implementation.

We'll write the code for both solutions line-by-line, analyze their time and space complexity (Big O notation), and discuss the key takeaways so you can apply these fundamental techniques to other coding challenges.

Perfect for coding interview preparation and improving problem-solving skills.

👍 Like, Subscribe, and Comment! Let me know what problems you'd like to see solved.

Solution Link:
https://leetcode.com/problems/find-lu...

#leetcode #python #algorithms #codinginterview #dailycoding

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