Practice Real Company Assessment Patterns • Latest 2025–2026 Mock Tests

Programming Exercises

Find the first non-repeating character in a string.

Medium

Problem Statement

Find the first non-repeating character in a string.

Sample Input

"swiss"

Sample Output

w

Limits

Time: 2s · Memory: 256 MB

Code Editor
00:00
import java.util.*; public class Main { public static char firstNonRepeatingCharacter() { String str = "swiss"; // Your code here return ' '; } }
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Input
"swiss"
Expected Output
w