Count the Number of Special Characters II | LeetCode 3121 | Java Code | Developer Coder

Master the solution to LeetCode 3121 – Count the Number of Special Characters II in Java! In this video on the Developer Coder channel, we break down an efficient coding interview approach to solve this medium-level LeetCode problem step-by-step. Perfect for students, software engineers, coding interview preparation, and anyone improving their Data Structures & Algorithms skills.

🚀 In this video, you will learn:
✔️ Efficient Java implementation
✔️ Character handling techniques
✔️ String traversal concepts
✔️ Interview-focused coding strategy
✔️ Time Complexity Analysis
✔️ Space Complexity Analysis
✔️ Clean and optimized coding style
✔️ LeetCode medium problem-solving approach

This problem is highly useful for coding interviews at top tech companies and helps strengthen your understanding of strings, hashing, sets, ASCII operations, and character frequency concepts.

📌 Problem Name:
LeetCode 3121 - Count the Number of Special Characters II

🎯 Language Used:
Java

💻 Channel:
Developer Coder

📚 Ideal For:

LeetCode Preparation
DSA Practice
Coding Interviews
Java Programming
FAANG Interview Prep
Competitive Programming

🔔 Subscribe to Developer Coder for more LeetCode solutions, Java coding tutorials, DSA concepts, interview preparation videos, and programming content.

Count the Number of Special Characters I [ LeetCode 3120 ] - https://youtu.be/PtG7Agbwo_E?si=2_w7ugJfFCDk41KU

Github: https://github.com/abhinavsharma2471716/dsa-java/blob/main/2026/Leetcode%20Daily%20Problems/Strings/3121.%20Count%20the%20Number%20of%20Special%20Characters%20II

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