Practice Problems

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

Practice Problems — 1200-1600

#ProblemTopicsDifficulty
31 Roman Numerals implementation 1200
74 Rotation of Each Other strings 1200
75 Three Kinds of Brackets strings stack 1200
90 Flips to Alternate strings greedy 1200
91 Fair Binary Split strings prefix-sums 1200
94 Equilibrium Index prefix-sums 1200
98 Best Window of Size K sliding-window 1200
99 Coldest Stretch sliding-window 1200
134 Rotate 90 Degrees implementation 1200
143 Distinct Prime Factors math number-theory 1200
154 Counting Euclid's Steps math 1200
171 The Missing Term math 1200
176 Happy Number math implementation 1200
180 Multiples of A or B math 1200
189 Content Children greedy sorting 1200
193 Integer Square Root math binary-search 1200
202 Frog Hops dp 1200
223 The Lonely Number bitwise 1200
230 Friend Circles graphs 1200
231 The Largest Circle graphs 1200
233 Is There a Route graphs 1200
247 Height of the Tree bfs trees 1200
282 The Divisor Game math games 1200
283 Race to N math games 1200
286 Look and Say implementation strings 1200
297 Binary Addition math strings 1200
319 Valid IPv4 Address implementation strings 1200
339 Squares in a Range math 1200
346 Spreadsheet Column Name math implementation 1200
360 League Champion implementation 1200
368 Compound Doubling math 1200
383 Bulls and Cows implementation 1200
387 Reverse Every Other Chunk strings 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
423 Balanced Prefix strings prefix-sums 1200
435 Mirror the Bits bitwise 1200
440 Forgetful Addition implementation 1200
443 Deletions to Anagrams strings 1200
445 Favourite Bigram strings 1200
448 All the Rectangles math combinatorics 1200
459 All Gray Codes bitwise 1200
470 Position of the K-th One implementation binary-search 1200
478 One Perfect Trade dp greedy 1200
482 Longest Arithmetic Stretch implementation 1200
486 One Meeting Room intervals sorting 1200
491 Magic Square implementation 1200
493 Parse the Number implementation strings 1200