DSA Solutions - Page 8

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

2163.Minimum Difference in Sums After Removal of Elements

2167.Minimum Time to Remove All Cars Containing Illegal Goods

2172.Maximum AND Sum of Array

2184.Number of Ways to Build Sturdy Brick Wall

2188.Minimum Time to Finish the Race

2189.Number of Ways to Build House of Cards

2209.Minimum White Tiles After Covering With Carpets

2218.Maximum Value of K Coins From Piles

2222.Number of Ways to Select Buildings

2247.Maximum Cost of Trip With K Highways

2262.Total Appeal of A String

2263.Make Array Non-decreasing or Non-increasing

2266.Count Number of Texts

2267. Check if There Is a Valid Parentheses String Path

2272.Substring With Largest Variance

2291.Maximum Profit From Trading Stocks

2297.Jump Game VIII

2304.Minimum Path Cost in a Grid

2305.Fair Distribution of Cookies

2310.Sum of Numbers With Units Digit K

2311.Longest Binary Subsequence Less Than or Equal to K

2312.Selling Pieces of Wood

2313.Minimum Flips in Binary Tree to Get Result

2318.Number of Distinct Roll Sequences

2320.Count Number of Ways to Place Houses

2321.Maximum Score Of Spliced Array

2327.Number of People Aware of a Secret

2328.Number of Increasing Paths in a Grid

2338.Count the Number of Ideal Arrays

2355.Maximum Number of Books You Can Take

2361.Minimum Costs Using the Train Line

2369.Check if There is a Valid Partition For The Array

2370.Longest Ideal Subsequence

2376.Count Special Integers

2378.Choose Edges to Maximize Score in a Tree

2380.Time Needed to Rearrange a Binary String

2393.Count Strictly Increasing Subarrays

2400.Number of Ways to Reach a Position After Exactly k Steps

2403.Minimum Time to Kill All Monsters

2407.Longest Increasing Subsequence II

2420.Find All Good Indices

2430.Maximum Deletions on a String

2431.Maximize Total Tastiness of Purchased Fruits

2435.Paths in Matrix Whose Sum Is Divisible by K

2436.Minimum Split Into Subarrays With GCD Greater Than One

2439.Minimize Maximum of Array

2463.Minimum Total Distance Traveled

2464.Minimum Subarrays in a Valid Split

2466.Count Ways To Build Good Strings

2472.Maximum Number of Non-overlapping Palindrome Substrings

How to use these solutions