Neetcode
Spaced Repetition
S
ystem
Dashboard
Problems
Drill
Mock
Info
Log Attempt
202. Happy Number
How did it go?
Could not solve
Partial — needed hint / AI
Solved independently
Solve Time (min)
Study Time (min)
Rewrote from Scratch?
No
Yes
Confidence
1
2
3
4
5
Can pseudocode optimal, maybe code
Notes
▸ Add code
Save Attempt
Log Attempt — Happy Number — NeetcodeSRS