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Combinatorics DSA Problems

Combinatorics is an important concept in data structures and algorithms. Practice these problems to master Combinatorics and prepare for technical interviews.

43
Total Problems
2
Easy
15
Medium
26
Hard

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ArrayBacktrackingBashBiconnected ComponentBinary Indexed TreeBinary Search
62. Unique Paths
MediumAccoloite +41Combinatorics +265.0714%
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LeetCode
458. Poor Pigs
HardAdobe +2Combinatorics +259.411%
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920. Number of Music Playlists
HardAmazon +3Combinatorics +260.2671%
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LeetCode
1201. Ugly Number III
MediumAmerican ExpressBinary Search +330.0113%
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LeetCode
1359. Count All Valid Pickup and Delivery Options
HardApple +3Combinatorics +264.9167%
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1467. Probability of a Two Boxes Having The Same Number of Distinct Balls
HardArray +559.9882%
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LeetCode
1569. Number of Ways to Reorder Array to Get Same BST
HardGoogleArray +953.4594%
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1621. Number of Sets of K Non-Overlapping Line Segments
MediumAmazonCombinatorics +244.0047%
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1641. Count Sorted Vowel Strings
MediumGoogle +1Combinatorics +278.6694%
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1643. Kth Smallest Instructions
HardHeavyWaterArray +347.3879%
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1735. Count Ways to Make Array With Product
HardAmazonArray +451.8414%
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LeetCode
1830. Minimum Number of Operations to Make String Sorted
HardSamsungCombinatorics +250.0893%
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1863. Sum of All Subset XOR Totals
EasyAdobeArray +587.7707%
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1866. Number of Ways to Rearrange Sticks With K Sticks Visible
HardGoogleCombinatorics +258.0829%
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1916. Count Ways to Build Rooms in an Ant Colony
HardAdobeCombinatorics +548.9364%
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LeetCode
2063. Vowels of All Substrings
MediumServiceNowCombinatorics +354.2805%
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2221. Find Triangular Sum of an Array
MediumAmazonArray +378.6694%
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2338. Count the Number of Ideal Arrays
HardInfosysCombinatorics +326.9159%
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2400. Number of Ways to Reach a Position After Exactly k Steps
MediumAmazonCombinatorics +235.5089%
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2514. Count Anagrams
HardMathworksCombinatorics +434.0654%
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