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

Programming Exercises

Find the longest substring without repeating characters

Hard

Problem Statement

Find the longest substring without repeating characters

Sample Input

"abcabcbb"

Sample Output

abc

Limits

Time: 2s · Memory: 256 MB

Code Editor
00:00
import java.util.*; public class Main { public static String longestUniqueSubstring() { String str = "abcabcbb"; // Your code here return ""; } }
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Input
"abcabcbb"
Expected Output
abc