DSA Solutions - Page 4

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.

All problems Topics Company questions Sheets

Solutions, explained

3602.Hexadecimal and Hexatrigesimal Conversion

3622.Check Divisibility by Digit Sum and Product

3658.GCD of Odd and Even Sums

3663.Find The Least Frequent Digit

3667.Sort Array By Absolute Value

3697.Compute Decimal Representation

3726.Remove Zeros in Decimal Representation

3736.Minimum Moves to Equal Array Elements III

3750.Minimum Number of Flips to Reverse Binary String

3754.Concatenate Non-Zero Digits and Multiply by Sum I

3783.Mirror Distance of an Integer

3870.Count Commas in Range

3875.Construct Uniform Parity Array I

3894.Traffic Signal Color

3908.Valid Digit Number

3945.Digit Frequency Score

3959.Check Good Integer

3982.Sum of Integers with Maximum Digit Range

3986.Number of Elapsed Seconds Between Two Times

3996.Even Number of Knight Moves

4000.Largest Integer With Given Digit Sum

4010.Maximize Pair Strength Using GCD

4061.Minimum Queen Moves to Reach Target

How to use these solutions