Practice Problems

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

Practice Problems — math

#ProblemTopicsDifficulty
176 Happy Number math implementation 1200
180 Multiples of A or B math 1200
193 Integer Square Root math binary-search 1200
282 The Divisor Game math games 1200
283 Race to N math games 1200
297 Binary Addition math strings 1200
339 Squares in a Range math 1200
346 Spreadsheet Column Name math implementation 1200
368 Compound Doubling math 1200
395 Count Cubes in a Range math 1200
397 Count Triangulars in a Range math 1200
401 Count Fibonaccis in a Range math 1200
407 Digits on the Pages math 1200
448 All the Rectangles math combinatorics 1200
661 Make Everyone Equal math sorting 1200
721 Repdigits in Range math digit-dp 1200
39 Angle Between Clock Hands math 1300
140 Is It Prime math number-theory 1300
141 Count the Primes math number-theory 1300
142 Largest Prime Factor math number-theory 1300
144 Prime Factorization math number-theory 1300
145 Count the Divisors math number-theory 1300
157 Modular Power math 1300
177 Kaprekar's Routine math implementation 1300
179 Zeros at the End of N! math 1300
181 XOR of 1..N math bitwise 1300
229 N-th Gray Code math bitwise 1300
278 Grid Points on a Segment math geometry 1300
280 Take-Away Game math games 1300
303 What Day Was It math implementation 1300
313 Palindromic Prime math 1300
314 Emirp math 1300
335 Two Circles math geometry 1300
344 A Row of Pascal's Triangle math combinatorics 1300
372 Two Kinds of Stamps math 1300
403 Count Pentagonals in a Range math 1300
405 Count Hexagonals in a Range math 1300
422 Zero Then One math strings 1300
426 Geometric or Not math 1300
441 Counting the Carries math implementation 1300
449 All the Squares math 1300
454 Beautiful Permutation math implementation 1300
456 Emptying Two Piles math 1300
517 Local or Global math implementation 1300
724 Divisible by Digit Count math digit-dp 1300
47 The Josephus Survivor math implementation 1400
121 Best Product of Three math sorting 1400
146 Sum of Divisors math number-theory 1400
149 Goldbach Split math number-theory 1400
150 Twin Prime Pairs math number-theory 1400