Hiring process8 levels
  1. 1 IQ Test
  2. 2 Additional Online Test (If Required)
  3. 3 Office Interview with Hiring Manager
  4. 4 Unpaid Test Task (Motivation Check)
  5. 5 Paid Test Task and Follow-Up Interview
  6. 6 Iterative Paid Test Tasks
  7. 7 Office Verification
  8. 8 Final Interview with the Founder

Practice Problems

Daily Challenge: Fewest Hops (1300) Solve it to start a streak

implementation Problems

121 practice problems tagged implementation , from difficulty 800 to 1400 — solve them in our in-browser judge with instant verdicts. Browse all problems.

Related: math strings sorting binary-search

ProblemTopics Solvers Acceptance Difficulty
Balanced Brackets implementation strings 0 — 1000
Evens First, Order Kept implementation sorting 0 — 1000
Rotate Right by K implementation 0 — 1000
Symmetric Matrix implementation 0 — 1000
Armstrong Number math implementation 0 — 1000
Exactly One Side implementation 0 — 1000
Collatz Steps math implementation 0 — 1000
Collatz Peak math implementation 0 — 1000
Valid Integer implementation strings 0 — 1000
Strong Enough Password implementation strings 0 — 1000
Valid Username implementation strings 0 — 1000
Sum of the Others implementation 0 — 1000
Equal Pairs implementation 37
76%
1000
12-Hour to 24-Hour implementation 0 — 1000
The Careful Bank implementation 0 — 1000
First Stockout Day implementation 0 — 1000
Election Night implementation 0 — 1000
Dry Spells implementation 0 — 1000
Diamond implementation 0 — 1000
The Letter X implementation 0 — 1000
Closest to 21 implementation 0 — 1000
Additive Sequence math implementation 0 — 1000
A True Permutation implementation 0 — 1000
How Many Times Does X Appear implementation 0 — 1000
Boustrophedon implementation 5
100%
1000
Twice as Large implementation 0 — 1000
Count Sign Changes implementation 0 — 1100
Majority Element implementation 0 — 1100
Candy Rounds implementation 0 — 1100
Third Distinct Maximum implementation 0 — 1100
Alternating Parity Stretch implementation 0 — 1100
Multiplicative Persistence math implementation 0 — 1100
Common Elements implementation 0 — 1100
Spreadsheet Column Number math implementation 0 — 1100
Digit Duel implementation 0 — 1100
Anti-Diagonal Sums implementation 0 — 1100
Toeplitz Matrix implementation 0 — 1100
Roman Numerals implementation 1
100%
1200
Rotate 90 Degrees implementation 0 — 1200
Happy Number math implementation 0 — 1200
Look and Say implementation strings 0 — 1200
Valid IPv4 Address implementation strings 0 — 1200
Spreadsheet Column Name math implementation 0 — 1200
League Champion implementation 1
100%
1200
Bulls and Cows implementation 0 — 1200
Forgetful Addition implementation 0 — 1200
Position of the K-th One implementation binary-search 0 — 1200
Longest Arithmetic Stretch implementation 0 — 1200
Magic Square implementation 0 — 1200
Parse the Number implementation strings 0 — 1200