Combinatorics

49 LeetCode questions

Difficulty Distribution

Easy
3
6%
Medium
17
35%
Hard
29
59%

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Questions

TitleDifficulty
Unique PathsMedium
Count All Valid Pickup and Delivery OptionsHard
Sum of All Subset XOR TotalsEasy
Count Ways to Build Rooms in an Ant ColonyHard
Check If Digits Are Equal in String After Operations IIHard
Find Triangular Sum of an ArrayMedium
Find the Number of Possible Ways for an EventHard
Check If Digits Are Equal in String After Operations IEasy
Distribute Candies Among Children IIMedium
Find Number of Ways to Reach the K-th StairHard
Count the Number of Ideal ArraysHard
The Number of Beautiful SubsetsMedium
Distribute Candies Among Children IEasy
Distribute Candies Among Children IIIHard
Count the Number of K-Free SubsetsMedium
Number of Sets of K Non-Overlapping Line SegmentsMedium
Count Ways to Make Array With ProductHard
Manhattan Distances of All Arrangements of PiecesHard
Count the Number of Arrays with K Matching Adjacent ElementsHard
Count the Number of Computer Unlocking PermutationsMedium
Kth Smallest InstructionsHard
Ugly Number IIIMedium
Maximum and Minimum Sums of at Most Size K SubsequencesMedium
Find the Count of Monotonic Pairs IHard
Maximum Score with Co-Prime ElementHard
Find the Count of Monotonic Pairs IIHard
Number of Music PlaylistsHard
Number of Ways to Reorder Array to Get Same BSTHard
Find Nth Smallest Integer With K One BitsHard
Number of Ways to Reach a Position After Exactly k StepsMedium
Count Number of Balanced PermutationsHard
Find the Count of Good IntegersHard
Count K-Subsequences of a String With Maximum BeautyHard
Poor PigsHard
Count the Number of Good PartitionsHard
Number of Ways to Rearrange Sticks With K Sticks VisibleHard
Sorted GCD Pair QueriesHard
Right TrianglesMedium
Count Sorted Vowel StringsMedium
Find the Derangement of An ArrayMedium
Count AnagramsHard
Number of Strings Which Can Be Rearranged to Contain SubstringMedium
Count the Number of Good SubsequencesMedium
Count the Number of Infection SequencesHard
Minimum Number of Operations to Make String SortedHard
Count K-Reducible Numbers Less Than NHard
Vowels of All SubstringsMedium
Number of Ways to Reach Destination in the GridHard
Find the N-th Value After K SecondsMedium

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