DSA Solutions - Page 18

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

2967.Minimum Cost to Make Array Equalindromic

2971.Find Polygon With the Largest Perimeter

2975.Maximum Square Area by Removing Fences From a Field

2976.Minimum Cost to Convert String I

2992.Number of Self-Divisible Permutations

2997.Minimum Number of Operations to Make Array XOR Equal to K

3001.Minimum Moves to Capture The Queen

3002.Maximum Size of a Set After Removals

3004.Maximum Subtree of the Same Color

3011.Find if Array Can Be Sorted

3012.Minimize Length of Array Using Operations

3020.Find the Maximum Number of Elements in Subset

3023.Find Pattern in Infinite Stream I

3025.Find the Number of Ways to Place People I

3026.Maximum Good Subarray Sum

3030.Find the Grid of Region Average

3034.Number of Subarrays That Match a Pattern I

3035.Maximum Palindromes After Operations

3039.Apply Operations to Make String Empty

3040.Maximum Number of Operations With the Same Score II

3043.Find the Length of the Longest Common Prefix

3044.Most Frequent Prime

3047.Find the Largest Area of Square Inside Two Rectangles

3048.Earliest Second to Mark Indices I

3066.Minimum Operations to Exceed Threshold Value II

3067.Count Pairs of Connectable Servers in a Weighted Tree Network

3070.Count Submatrices with Top-Left Element and Sum Less Than k

3071.Minimum Operations to Write the Letter Y on a Grid

3073.Maximum Increasing Triplet Value

3075.Maximize Happiness of Selected Children

3076.Shortest Uncommon Substring in an Array

3078.Match Alphanumerical Pattern in Matrix I

3080.Mark Elements on Array by Performing Queries

3092.Most Frequent IDs

3096.Minimum Levels to Gain More Points

3097.Shortest Subarray With OR at Least K II

3101.Count Alternating Subarrays

3107.Minimum Operations to Make Median of Array Equal to K

3109.Find the Index of Permutation

3111.Minimum Rectangles to Cover Points

3112.Minimum Time to Visit Disappearing Nodes

3115.Maximum Prime Difference

3122.Minimum Number of Operations to Satisfy Conditions

3128.Right Triangles

3132.Find the Integer Added to Array II

3143.Maximum Points Inside the Square

3147.Taking Maximum Energy From the Mystic Dungeon

3148.Maximum Difference Score in a Grid

3152.Special Array II

3153.Sum of Digit Differences of All Pairs

How to use these solutions