Practice Problems

Problem of the Day: Integer Square Root — keep your streak alive!

Practice Problems — 800-1200

#ProblemTopicsDifficulty
285 Collatz Peak math implementation 1000
293 Tetrahedral Numbers math 1000
301 Order by Last Digit sorting 1000
302 Shortest Words First strings sorting 1000
305 Abundant Number math 1000
308 Automorphic Number math 1000
309 Disarium Number math 1000
312 Power of Three math 1000
315 Valid Integer implementation strings 1000
317 Strong Enough Password implementation strings 1000
318 Valid Username implementation strings 1000
325 Sum of the Others implementation 1000
329 Points in the Box geometry 1000
330 Bounding Box geometry 1000
333 Three in a Line math geometry 1000
338 Equal Pairs implementation 1000
343 The First N Primes math 1000
349 12-Hour to 24-Hour implementation 1000
353 Mask the Email strings 1000
354 The Careful Bank implementation 1000
355 First Stockout Day implementation 1000
357 Election Night implementation 1000
361 Dry Spells implementation 1000
366 The Final Exam math 1000
367 Doubling Your Money math 1000
370 Taxi Fare Bands math 1000
374 Bacteria in a Dish math 1000
377 Diamond implementation 1000
378 The Letter X implementation 1000
385 Closest to 21 implementation 1000
396 The K-th Cube Number math 1000
398 The K-th Triangular Number math 1000
399 Count Power Of Twos in a Range math 1000
402 The K-th Fibonacci Number math 1000
416 Even-Sum Pairs math 1000
425 Additive Sequence math implementation 1000
428 A True Permutation implementation 1000
444 Evening the Counts strings 1000
469 How Many Times Does X Appear implementation 1000
480 Sort the Flag sorting two-pointers 1000
488 Boustrophedon implementation 1000
492 Twice as Large implementation 1000
857 Triangular Number Modulo math 1000
6 Fibonacci Number math dp 1100
13 Product Modulo 1e9+7 math 1100
16 Count Sign Changes implementation 1100
20 Majority Element implementation 1100
30 Decimal to Base K math 1100
48 Candy Rounds implementation 1100
70 Palindrome, Roughly strings 1100