3690.Split and Merge Array Transformation
MediumArrayBreadth-First SearchHash Table58.7% acceptance1 companyVideo
With video · 764 results
3692.Majority Frequency Characters
EasyCountingHash TableString66.3% acceptanceVideo
3694.Distinct Points Reachable After Substring Removal
MediumHash TablePrefix SumSliding Window53.9% acceptanceVideo
3712.Sum of Elements With Frequency Divisible by K
EasyArrayCountingHash Table77.7% acceptanceVideo
3713.Longest Balanced Substring I
MediumCountingEnumerationHash Table69.1% acceptance4 companiesVideo
3714.Longest Balanced Substring II
MediumHash TablePrefix SumString42.0% acceptance6 companiesVideo
3718.Smallest Missing Multiple of K
EasyArrayHash Table71.5% acceptanceVideo
3719.Longest Balanced Subarray I
MediumArrayDivide and ConquerHash Table65.6% acceptance4 companiesVideo
3720.Lexicographically Smallest Permutation Greater Than Target
MediumCountingEnumerationGreedy48.2% acceptance2 companiesVideo
3721.Longest Balanced Subarray II
HardArrayDivide and ConquerHash Table33.7% acceptance2 companiesVideo
3728.Stable Subarrays With Equal Boundary and Interior Sum
MediumArrayHash TablePrefix Sum26.6% acceptance2 companiesVideo
3729.Count Distinct Subarrays Divisible by K in Sorted Array
HardArrayHash TablePrefix Sum27.4% acceptanceVideo
3731.Find Missing Elements
EasyArrayHash TableSorting88.6% acceptance2 companiesVideo
3737.Count Subarrays With Majority Element I
MediumArrayCountingDivide and Conquer75.7% acceptance5 companiesVideo
3739.Count Subarrays With Majority Element II
HardArrayDivide and ConquerHash Table65.2% acceptance2 companiesVideo
3740.Minimum Distance Between Three Equal Elements I
EasyArrayHash Table73.4% acceptance2 companiesVideo
3741.Minimum Distance Between Three Equal Elements II
MediumArrayHash Table74.3% acceptance3 companiesVideo
3755.Find Maximum Balanced XOR Subarray Length
MediumArrayBit ManipulationHash Table50.8% acceptanceVideo
3760.Maximum Substrings With Distinct Start
MediumHash TableString90.4% acceptanceVideo
3761.Minimum Absolute Distance Between Mirror Pairs
MediumArrayHash TableMath59.1% acceptance4 companiesVideo
3779.Minimum Number of Operations to Have Distinct Elements
MediumArrayHash Table42.1% acceptance1 companyVideo
3784.Minimum Deletion Cost to Make All Characters Equal
MediumArrayEnumerationHash Table55.0% acceptanceVideo
3790.Smallest All-Ones Multiple
MediumHash TableMath46.8% acceptanceVideo
3795.Minimum Subarray Length With Distinct Sum At Least K
MediumArrayHash TableSliding Window31.7% acceptance1 companyVideo
3803.Count Residue Prefixes
EasyHash TableString65.2% acceptance2 companiesVideo
3804.Number of Centered Subarrays
MediumArrayEnumerationHash Table66.5% acceptanceVideo
3805.Count Caesar Cipher Pairs
MediumArrayCountingHash Table50.7% acceptance1 companyVideo
3810.Minimum Operations to Reach Target Array
MediumArrayGreedyHash Table62.7% acceptanceVideo
3811.Number of Alternating XOR Partitions
MediumArrayBit ManipulationDynamic Programming27.3% acceptanceVideo
3815.Design Auction System
MediumDesignHash TableHeap (Priority Queue)41.9% acceptance1 companyVideo
3816.Lexicographically Smallest String After Deleting Duplicate Characters
HardGreedyHash TableMonotonic Stack20.9% acceptance2 companiesVideo
3822.Design Order Management System
MediumDesignHash Table79.0% acceptance1 companyPremium elsewhere, free hereVideo
3829.Design Ride Sharing System
MediumData StreamDesignHash Table62.6% acceptance1 companyVideo
3839.Number of Prefix Connected Groups
MediumArrayCountingHash Table59.9% acceptanceVideo
3842.Toggle Light Bulbs
EasyArrayHash TableSimulation71.2% acceptance1 companyVideo
3843.First Element with Unique Frequency
MediumArrayCountingHash Table69.9% acceptanceVideo
3846.Total Distance to Type a String Using One Finger
MediumHash TableString89.9% acceptancePremium elsewhere, free hereVideo
3852.Smallest Pair With Different Frequencies
EasyArrayCountingHash Table68.5% acceptance1 companyVideo
3853.Merge Close Characters
MediumHash TableString53.9% acceptance1 companyVideo
3859.Count Subarrays With K Distinct Integers
HardArrayCountingHash Table21.0% acceptanceVideo
3866.First Unique Even Element
EasyArrayCountingHash Table65.6% acceptanceVideo
3868.Minimum Cost to Equalize Arrays Using Swaps
MediumArrayCountingGreedy48.7% acceptance2 companiesVideo
3873.Maximum Points Activated with One Addition
HardArrayHash TableUnion Find42.8% acceptanceVideo
3885.Design Event Manager
MediumArrayDesignHash Table50.3% acceptance1 companyVideo
3889.Mirror Frequency Distance
MediumCountingHash TableString60.7% acceptanceVideo
3890.Integers With Multiple Sum of Two Cubes
MediumCountingEnumerationHash Table54.9% acceptanceVideo
3900.Longest Balanced Substring After One Swap
MediumHash TablePrefix SumString14.2% acceptance1 companyVideo
3926.Count Valid Word Occurrences
MediumArrayCountingHash Table48.1% acceptanceVideo
3934.Smallest Unique Subarray
HardArrayBinary SearchHash Function39.7% acceptanceVideo
3941.Password Strength
MediumHash TableString74.5% acceptanceVideo
Showing 701–750 of 764
How to use these solutions
Each solution breaks the problem into approaches, usually from brute force to the best one, and explains why each works. Code comes in Python, Java, C++ and other languages. Knowing why an approach works matters more in an interview than remembering the code.
- Try the problem first. Give it at least 20 minutes before you open the solution.
- Read every approach. The brute force shows you the problem; the faster ones show the pattern.
- Check the complexity. Note the time and space of each approach and what makes the difference.
- Write it yourself. Close the solution and code it from memory in the editor.
- Come back in a week. Solving it again later is what makes the pattern stick.