DSA Solutions - Page 16

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

2956.Find Common Elements Between Two Arrays

2960.Count Tested Devices After Test Operations

2965.Find Missing and Repeated Values

2970.Count the Number of Incremovable Subarrays I

2974.Minimum Number Game

2980.Check if Bitwise OR Has Trailing Zeros

2985.Calculate Compressed Mean

2987.Find Expensive Cities

2990.Loan Types

2996.Smallest Missing Integer Greater Than Sequential Prefix Sum

3000.Maximum Area of Longest Diagonal Rectangle

3005.Count Elements With Maximum Frequency

3010.Divide an Array Into Subarrays With Minimum Cost I

3014.Minimum Number of Pushes to Type Word I

3019.Number of Changing Keys

3024.Type of Triangle

3028.Ant on the Boundary

3032.Count Numbers With Unique Digits II

3033.Modify the Matrix

3038.Maximum Number of Operations With the Same Score I

3042.Count Prefix and Suffix Pairs I

3046.Split the Array

3051.Find Candidates for Data Scientist Position

3053.Classifying Triangles by Lengths

3059.Find All Unique Email Domains

3062.Winner of the Linked List Game

3063.Linked List Frequency

3065.Minimum Operations to Exceed Threshold Value I

3069.Distribute Elements Into Two Arrays I

3074.Apple Redistribution into Boxes

3079.Find the Sum of Encrypted Integers

3083.Existence of a Substring in a String and Its Reverse

3090.Maximum Length Substring With Two Occurrences

3095.Shortest Subarray With OR at Least K I

3099.Harshad Number

3105.Longest Strictly Increasing or Strictly Decreasing Subarray

3110.Score of a String

3114.Latest Time You Can Obtain After Replacing Characters

3120.Count the Number of Special Characters I

3127.Make a Square with the Same Color

3131.Find the Integer Added to Array I

3136.Valid Word

3142.Check if Grid Satisfies Conditions

3146.Permutation Difference between Two Strings

3150.Invalid Tweets II

3151.Special Array I

3158.Find the XOR of Numbers Which Appear Twice

3162.Find the Number of Good Pairs I

3168.Minimum Number of Chairs in a Waiting Room

3172.Second Day Verification

How to use these solutions