DSA Solutions - Page 3

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

1296.Divide Array in Sets of K Consecutive Numbers

1323.Maximum 69 Number

1326.Minimum Number of Taps to Open to Water a Garden

1328.Break a Palindrome

1330.Reverse Subarray To Maximize Array Value

1338.Reduce Array Size to The Half

1353.Maximum Number of Events That Can Be Attended

1363.Largest Multiple of Three

1382.Balance a Binary Search Tree

1383.Maximum Performance of a Team

1386.Cinema Seat Allocation

1388.Pizza With 3n Slices

1400.Construct K Palindrome Strings

1402.Reducing Dishes

1403.Minimum Subsequence in Non-Increasing Order

1405.Longest Happy String

1414.Find the Minimum Number of Fibonacci Numbers Whose Sum Is K

1432.Max Difference You Can Get From Changing an Integer

1433.Check If a String Can Break Another String

1465.Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts

1481.Least Number of Unique Integers after K Removals

1488.Avoid Flood in The City

1505.Minimum Possible Integer After at Most K Adjacent Swaps On Digits

1509.Minimum Difference Between Largest and Smallest Value in Three Moves

1520.Maximum Number of Non-Overlapping Substrings

1526.Minimum Number of Increments on Subarrays to Form a Target Array

1529.Minimum Suffix Flips

1536.Minimum Swaps to Arrange a Binary Grid

1537.Get the Maximum Score

1541.Minimum Insertions to Balance a Parentheses String

1546.Maximum Number of Non-Overlapping Subarrays With Sum Equals Target

1558.Minimum Numbers of Function Calls to Make Target Array

1561.Maximum Number of Coins You Can Get

1564.Put Boxes Into the Warehouse I

1567.Maximum Length of Subarray With Positive Product

1578.Minimum Time to Make Rope Colorful

1580.Put Boxes Into the Warehouse II

1585.Check If String Is Transformable With Substring Sort Operations

1589.Maximum Sum Obtained of Any Permutation

1605.Find Valid Matrix Given Row and Column Sums

1606.Find Servers That Handled Most Number of Requests

1642.Furthest Building You Can Reach

1647.Minimum Deletions to Make Character Frequencies Unique

1648.Sell Diminishing-Valued Colored Balls

1663.Smallest String With A Given Numeric Value

1665.Minimum Initial Energy to Finish Tasks

1671.Minimum Number of Removals to Make Mountain Array

1673.Find the Most Competitive Subsequence

1675.Minimize Deviation in Array

1686.Stone Game VI

How to use these solutions