3417.Zigzag Grid Traversal With Skip
EasyArrayMatrixSimulation64.9% acceptance3 companiesVideo
Easy · 976 results
3423.Maximum Difference Between Adjacent Elements in a Circular Array
EasyArray75.7% acceptance5 companiesVideo
3427.Sum of Variable Length Subarrays
EasyArrayPrefix Sum85.6% acceptance2 companiesVideo
3432.Count Partitions with Even Sum Difference
EasyArrayMathPrefix Sum85.2% acceptance5 companiesVideo
3436.Find Valid Emails
EasyDatabase44.1% acceptanceVideo
3438.Find Valid Pair of Adjacent Digits in String
EasyCountingHash TableString60.7% acceptance3 companiesVideo
3442.Maximum Difference Between Even and Odd Frequency I
EasyCountingHash TableString60.7% acceptance4 companiesVideo
3450.Maximum Students on a Single Bench
EasyArrayHash Table87.8% acceptancePremium elsewhere, free hereVideo
3452.Sum of Good Numbers
EasyArray69.6% acceptance2 companiesVideo
3456.Find Special Substring of Length K
EasyString35.1% acceptance1 companyVideo
3461.Check If Digits Are Equal in String After Operations I
EasyCombinatoricsMathNumber Theory82.5% acceptance4 companiesVideo
3465.Find Products with Valid Serial Numbers
EasyDatabase28.5% acceptanceVideo
3467.Transform Array by Parity
EasyArrayCountingSorting89.7% acceptance1 companyVideo
3471.Find the Largest Almost Missing Integer
EasyArrayHash Table49.4% acceptance2 companiesVideo
3477.Fruits Into Baskets II
EasyArrayBinary SearchOrdered Set70.2% acceptance5 companiesVideo
3483.Unique 3-Digit Even Numbers
EasyArrayEnumerationHash Table79.8% acceptance3 companiesVideo
3487.Maximum Unique Subarray Sum After Deletion
EasyArrayGreedyHash Table40.5% acceptance5 companiesVideo
3491.Phone Number Prefix
EasyArraySortingString69.9% acceptancePremium elsewhere, free hereVideo
3492.Maximum Containers on a Ship
EasyMath75.2% acceptance1 companyVideo
3498.Reverse Degree of a String
EasySimulationString91.9% acceptance2 companiesVideo
3502.Minimum Cost to Reach Every Position
EasyArray82.6% acceptanceVideo
3507.Minimum Pair Removal to Sort Array I
EasyArrayDoubly-Linked ListHash Table65.3% acceptance5 companiesVideo
3512.Minimum Operations to Make Array Sum Divisible by K
EasyArrayMath92.4% acceptance4 companiesVideo
3516.Find Closest Person
EasyMath88.9% acceptance4 companiesVideo
3536.Maximum Product of Two Digits
EasyMathSorting75.7% acceptance1 companyVideo
3541.Find Most Frequent Vowel and Consonant
EasyCountingHash TableString89.4% acceptance3 companiesVideo
3545.Minimum Deletions for At Most K Distinct Characters
EasyCountingGreedyHash Table72.2% acceptance2 companiesVideo
3550.Smallest Index With Digit Sum Equal to Index
EasyArrayMath84.6% acceptance1 companyVideo
3560.Find Minimum Log Transportation Cost
EasyMath42.2% acceptanceVideo
3570.Find Books with No Available Copies
EasyDatabase56.1% acceptance1 companyVideo
3571.Find the Shortest Superstring II
EasyString48.8% acceptancePremium elsewhere, free hereVideo
3581.Count Odd Letters from Number
EasyCountingHash TableSimulation85.1% acceptancePremium elsewhere, free hereVideo
3582.Generate Tag for Video Caption
EasySimulationString32.4% acceptance1 companyVideo
3591.Check if Any Element Has Prime Frequency
EasyArrayCountingHash Table62.6% acceptanceVideo
3602.Hexadecimal and Hexatrigesimal Conversion
EasyMathString79.4% acceptance1 companyVideo
3606.Coupon Code Validator
EasyArrayHash TableSorting64.4% acceptance2 companiesVideo
3622.Check Divisibility by Digit Sum and Product
EasyMath74.5% acceptanceVideo
3633.Earliest Finish Time for Land and Water Rides I
EasyArrayBinary SearchGreedy73.0% acceptance4 companiesVideo
3637.Trionic Array I
EasyArray49.5% acceptance4 companiesVideo
3643.Flip Square Submatrix Vertically
EasyArrayMatrixTwo Pointers79.3% acceptance2 companiesVideo
3658.GCD of Odd and Even Sums
EasyMathNumber Theory89.8% acceptance3 companiesVideo
3662.Filter Characters by Frequency
EasyCountingHash TableString86.2% acceptance1 companyPremium elsewhere, free here
3663.Find The Least Frequent Digit
EasyArrayCountingHash Table68.8% acceptance1 companyVideo
3667.Sort Array By Absolute Value
EasyArrayMathSorting86.7% acceptance1 companyPremium elsewhere, free hereVideo
3668.Restore Finishing Order
EasyArrayHash Table91.1% acceptance2 companiesVideo
3674.Minimum Operations to Equalize Array
EasyArrayBit ManipulationBrainteaser60.8% acceptanceVideo
3678.Smallest Absent Positive Greater Than Average
EasyArrayHash Table34.2% acceptanceVideo
3683.Earliest Time to Finish One Task
EasyArray84.5% acceptanceVideo
3684.Maximize Sum of At Most K Distinct Elements
EasyArrayGreedyHash Table76.8% acceptanceVideo
3687.Library Late Fee Calculator
EasyArraySimulation94.4% acceptancePremium elsewhere, free hereVideo
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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.