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Practice

Open a problem in the workspace. Run it. Check your work.

Reverse String
Algorithms · javascript · strings,warmup
easy Open IDE
Two Sum
Algorithms · javascript · arrays,hashmap
easy Open IDE
Valid Email
Backend · php · validation,security
easy Open IDE
FizzBuzz
Algorithms · python · loops
easy Open IDE
CSS Specificity
Frontend · css · css,frontend
easy Open IDE
HTML Landmark
Frontend · html · html,a11y
easy Open IDE
C# Palindrome
Algorithms · csharp · csharp,strings
easy Open IDE
Duplicate Users
Databases · sql · sql,aggregates
medium Open IDE
Optimize the Loop
Optimization · javascript · performance,hashmap
medium Open IDE
Fix Auth Guard
Security · javascript · security,debugging
medium Open IDE
REST Echo
APIs · php · api,backend
medium Open IDE
Java Frequency
Data Structures · java · java,maps
medium Open IDE
C++ Move Zeros
Arrays · cpp · cpp,two-pointers
medium Open IDE
Linked List Cycle
Data Structures · javascript · linked-list
hard Open IDE
Max Subarray
Algorithms · javascript · dp,arrays
hard Open IDE