First Non-Repeating Character Using ASCII | Java
Автор: Chandan Coding & Learning
Загружено: 2025-12-22
Просмотров: 5
Описание:
First Non-Repeating Character Using ASCII | Java
In this video, I explain how to find the first non-repeating character in a string using ASCII values in Java, without using HashMap.
You will learn:
What is ASCII value and why it is important
How characters are stored as numbers
How to convert a character into an array index using ASCII
Why we use array size 26 for lowercase letters
Step-by-step frequency count using ASCII
How to find the first non-repeating character
Complete Java code with dry run explanation
This approach is:
✔ Beginner-friendly
✔ Interview-oriented
✔ Time Complexity: O(n)
✔ Space Complexity: O(1)
📌 This concept is very useful for:
String problems
DSA preparation
Coding interviews
Java beginners
🔖 Hashtags
#ASCIIValue #Java #DSA #StringProblems #CodingForBeginners #JavaInterview
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