Practice Problems

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

Practice Problems — math

#ProblemTopicsDifficulty
284 Collatz Steps math implementation 1000
285 Collatz Peak math implementation 1000
293 Tetrahedral Numbers math 1000
305 Abundant Number math 1000
308 Automorphic Number math 1000
309 Disarium Number math 1000
312 Power of Three math 1000
333 Three in a Line math geometry 1000
343 The First N Primes math 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
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
857 Triangular Number Modulo math 1000
6 Fibonacci Number math dp 1100
13 Product Modulo 1e9+7 math 1100
30 Decimal to Base K math 1100
147 Perfect Number math 1100
152 GCD of Everything math number-theory 1100
167 Counting All Subsets math combinatorics 1100
173 Triangular Number math 1100
178 Multiplicative Persistence math implementation 1100
277 The Bishop's Colors math 1100
310 Factorion math 1100
311 Ugly Number math 1100
328 Closest to the Origin math geometry 1100
334 Right Triangle math geometry 1100
347 Spreadsheet Column Number math implementation 1100
364 Candles from Stubs math 1100
365 Working Together math 1100
371 Wrapper Promotion math 1100
393 Count Squares in a Range math 1100
404 The K-th Pentagonal Number math 1100
406 The K-th Hexagonal Number math 1100
417 Even-Product Pairs math 1100
420 Raise Everyone Up math 1100
434 Power of Four math bitwise 1100
437 A Fixed Remainder math 1100
500 Sum of the First K Fibonacci Numbers math 1100
501 Stacking Pentagons math 1100
502 Stacking Hexagons math 1100
143 Distinct Prime Factors math number-theory 1200
154 Counting Euclid's Steps math 1200
171 The Missing Term math 1200