K5kC | Code & More

Computer Science

Algorithms Programming Languages Database System Design

Blind 75 Difficulty: Easy Difficulty: Medium Difficulty: Hard

Android Data Science Computer Vision Simulations

UUID Generator Code Formatter

First Duplicate Character in a String

Problem
Examples
Example 1
Example 2
Solution
Method 1 – Brute Force
Intuition
Approach
Complexity
Method 2 – Hash Map
Intuition
Approach
Code
Complexity

Similar Problems

First Unique element in an arrayEasy
First duplicate element in an array by its indexEasy

Related Tags

duplicates-algo array string string-algo array-algo

Continue Practicing

First Unique element in an arrayEasy First duplicate element in an array by its indexEasy

Privacy Disclaimer Report an Issue About

© 2026 K5kC | Code & More. All rights reserved.

चरैवेति चरैवेति | Keep moving on

First Duplicate Character in a String - Coding Problem | K5kC