Practice · judged on hidden tests
Problems
10 problems, ordered so each topic builds on the last.
- Not startedA cache that forgets what you have not usedLinked lists, Hash maps, DesignMedium
- Not startedGroup anagramsSorting, Hash maps, StringsMedium
- Not startedLongest stretch with no repeatsSliding window, Hash maps, StringsMedium
- Not startedMost frequent numbersHeaps, Sorting, Hash mapsMedium
- Not startedThe first letter that has appeared only once, so farHash maps, Stacks and queues, StringsMedium
- Not startedThe number more than halfHash maps, ArraysEasy
- Not startedThe number that appears onceHash maps, Bit manipulation, ArraysEasy
- Not startedTwo baskets, one row of treesSliding window, Hash maps, ArraysMedium
- Not startedTwo sumHash maps, ArraysEasy
- Not startedValid anagramSorting, Hash maps, StringsEasy