✅ Hidden Math Pattern 🤯 | Count Commas in Range | Contest 493

Leetcode Weekly Contest 493 solution for Count Commas in Range and Count Commas in Range II. In this video we solve both problems and explain the math trick needed when constraint increases up to 10^15.
Leetcode Weekly Contest 493 Solution
Count Commas in Range Problem
Problem 3870 looks very easy because we just count commas for numbers from 1 to n. But Problem 3871 becomes tricky due to huge constraints and requires pattern observation and optimization.

Topics covered in this video:

* Easy brute force idea
* Constraint shock and why brute force fails
* Mathematical pattern discovery
* Optimized solution in Java
* Time complexity explanation
🔥 Chapters:
00:00 Intro
00:25 Problem 3870 Explanation
03:20 Easy Solution Idea
05:10 Problem 3871 Constraint Shock
07:40 Pattern Discovery
10:30 Optimized Algorithm
13:20 Code Walkthrough
16:00 Complexity Analysis
17:30 Final Tips

This contest walkthrough is useful for competitive programming, coding interviews and Leetcode preparation.

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Видео ✅ Hidden Math Pattern 🤯 | Count Commas in Range | Contest 493 канала CodingHelp