DSA Solutions - Page 13

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

2575.Find the Divisibility Array of a String

2586.Count the Number of Vowel Strings in Range

2590.Design a Todo List

2606.Find the Substring With Maximum Cost

2609.Find the Longest Balanced Substring of a Binary String

2645.Minimum Additions to Make Valid String

2663.Lexicographically Smallest Beautiful String

2678.Number of Senior Citizens

2696.Minimum String Length After Removing Substrings

2697.Lexicographically Smallest Palindrome

2707.Extra Characters in a String

2710.Remove Trailing Zeros From a String

2712.Minimum Cost to Make All Characters Equal

2716.Minimize String Length

2719.Count of Integers

2730.Find the Longest Semi-Repetitive Substring

2734.Lexicographically Smallest String After Substring Operation

2743.Count Substrings Without Repeating Character

2744.Find Maximum Number of String Pairs

2746.Decremental String Concatenation

2767.Partition String Into Minimum Beautiful Substrings

2781.Length of the Longest Valid Substring

2785.Sort Vowels in a String

2788.Split Strings by Separator

2800.Shortest String That Contains Three Strings

2801.Count Stepping Numbers in Range

2802.Find The K-th Lucky Number

2810.Faulty Keyboard

2825.Make String a Subsequence Using Cyclic Increments

2828.Check if a String Is an Acronym of Words

2833.Furthest Point From Origin

2839.Check if Strings Can be Made Equal With Operations I

2840.Check if Strings Can be Made Equal With Operations II

2842.Count K-Subsequences of a String With Maximum Beauty

2844.Minimum Operations to Make a Special Number

2851.String Transformation

2864.Maximum Odd Binary Number

2896.Apply Operations to Make Two Strings Equal

2900.Longest Unequal Adjacent Groups Subsequence I

2901.Longest Unequal Adjacent Groups Subsequence II

2904.Shortest and Lexicographically Smallest Beautiful String

2911.Minimum Changes to Make K Semi-palindromes

2914.Minimum Number of Changes to Make Binary String Beautiful

2933.High-Access Employees

2937.Make Three Strings Equal

2938.Separate Black and White Balls

2942.Find Words Containing Character

2947.Count Beautiful Substrings I

2949.Count Beautiful Substrings II

2950.Number of Divisible Substrings

How to use these solutions