All problems
Sorting problems
9 problems: 1 easy, 6 medium and 2 hard. Start at the top; each one assumes the ones above it.
- Not startedEasyValid anagramHash maps, Strings, Sorting
- Not startedMediumCombine the ranges that overlapArrays, Greedy, Sorting
- Not startedMediumGroup anagramsHash maps, Strings, Sorting
- Not startedMediumHow many must you dropArrays, Greedy, Sorting
- Not startedMediumHow many triples add to zeroArrays, Two pointers, Sorting
- Not startedMediumMost frequent numbersHash maps, Arrays, Sorting, Heaps
- Not startedMediumSorting 0s, 1s and 2s in one passArrays, Two pointers, Sorting
- Not startedHardHow far the list is from sortedArrays, Sorting
- Not startedHardMerging many sorted lists at onceArrays, Sorting, Heaps