1,053 problems · 15 topics · 16 system design notes
Practice DSA.
Track every solve.
A quiet place to work through problems pattern by pattern, keep your notes, and build a daily streak.
Activity 23 day streak
Two SumEasy
Course ScheduleMedium
LRU CacheMedium
Trapping Rain WaterHard
Pattern by pattern
1,053 problems in 15 topics and 219 patterns, plus your own.
Streak & heatmap
Every solve lands on your calendar. Keep the chain going.
Notes and code
Write down the trick, the complexity, and save your solution.
Revision list
Bookmark the tricky ones and review them before interviews.
System design
16 in-depth notes, with sections you tick off as you read.
Straight to LeetCode
Every problem links to its LeetCode page in one click.