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🧵String Patterns Mastery (Interview Prep)
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🧵 Playlist

Top String Patterns Mastery (Interview Prep) Interview Questions

A structured, step-by-step roadmap designed to build pattern mastery, prioritizing the most frequently asked questions in top tech interviews.

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Reverse String
Easy
PracticeVideo
Reverse Words in a String
Medium
PracticeVideo
Valid Palindrome
Easy
PracticeVideo
String to Integer (atoi)
Medium
PracticeVideo
Find the Index of First Occurrence
Easy
PracticeVideo
Print Words Vertically
Medium
PracticeVideo
Reformat Phone Number
Easy
PracticeVideo
Rearrange Words in a Sentence
Medium
PracticeVideo
Faulty Keyboard
Easy
PracticeVideo
Reverse Degree of a String
Medium
PracticeVideo
Valid Anagram
Easy
PracticeVideo
Group Anagrams
Medium
PracticeVideo
Isomorphic Strings
Easy
PracticeVideo
First Unique Character in a String
Easy
PracticeVideo
Sort Characters by Frequency
Medium
PracticeVideo
Determine if Two Strings Are Close
Medium
PracticeVideo
Redistribute Characters to Make All Strings Equal
Easy
PracticeVideo
Count Common Words With One Occurrence
Easy
PracticeVideo
Percentage of Letter in String
Easy
PracticeVideo
Permutation Difference between Two Strings
Easy
PracticeVideo
Filter Characters by Frequency
Medium
PracticeVideo
Valid Palindrome II
Easy
PracticeVideo
Backspace String Compare
Easy
PracticeVideo
Reverse Vowels of a String
Easy
PracticeVideo
Furthest Point From Origin
Easy
PracticeVideo
Check if Strings Can be Made Equal With Operations I
Easy
PracticeVideo
Separate Black and White Balls
Medium
PracticeVideo
Longest Substring Without Repeating Characters
Medium
PracticeVideo
Minimum Window Substring
Hard
PracticeVideo
Permutation in String
Medium
PracticeVideo
Find All Anagrams in a String
Medium
PracticeVideo
Longest Repeating Character Replacement
Medium
PracticeVideo
Count Substrings with Only One Distinct Letter
Easy
PracticeVideo
Replace the Substring for Balanced String
Medium
PracticeVideo
Maximum Number of Removable Characters
Medium
PracticeVideo
Unique Substrings With Equal Digit Frequency
Medium
PracticeVideo
Longest Substring of One Repeating Character
Hard
PracticeVideo
Find the Longest Balanced Substring of a Binary String
Easy
PracticeVideo
Count Complete Substrings
Hard
PracticeVideo
Valid Parentheses
Easy
PracticeVideo
Remove Outermost Parentheses
Easy
PracticeVideo
Minimum Remove to Make Valid Parentheses
Medium
PracticeVideo
Score of Parentheses
Medium
PracticeVideo
Generate Parentheses
Medium
PracticeVideo
Longest Valid Parentheses
Hard
PracticeVideo
Valid Parenthesis String
Medium
PracticeVideo
Number of Atoms
Hard
PracticeVideo
Check If Word Is Valid After Substitutions
Medium
PracticeVideo
Parsing A Boolean Expression
Hard
PracticeVideo
Maximum Nesting Depth of Two Valid Parentheses Strings
Medium
PracticeVideo
Reverse Substrings Between Each Pair of Parentheses
Medium
PracticeVideo
The Score of Students Solving Math Expression
Hard
PracticeVideo
Longest Palindromic Substring
Medium
PracticeVideo
Palindromic Substrings
Medium
PracticeVideo
Longest Palindromic Subsequence
Medium
PracticeVideo
Shortest Palindrome
Hard
PracticeVideo
Can Make Palindrome from Substring
Medium
PracticeVideo
Find Longest Awesome Substring
Hard
PracticeVideo
Maximum Product of the Length of Two Palindromic Subsequences
Hard
PracticeVideo
Find Mirror Score of a String
Medium
PracticeVideo
Repeated Substring Pattern
Easy
PracticeVideo
Find First Occurrence in String
Easy
PracticeVideo
Longest Happy Prefix
Hard
PracticeVideo
Binary String With Substrings Representing 1 To N
Medium
PracticeVideo
Match Substring After Replacement
Hard
PracticeVideo
Substring XOR Queries
Medium
PracticeVideo
Minimum Time to Revert Word to Initial State I
Medium
PracticeVideo
Minimum Time to Revert Word to Initial State II
Hard
PracticeVideo
Number of Subarrays That Match a Pattern II
Hard
PracticeVideo
Count Prefix and Suffix Pairs I
Easy
PracticeVideo
Count Prefix and Suffix Pairs II
Hard
PracticeVideo
Implement Trie (Prefix Tree)
Medium
PracticeVideo
Longest Common Prefix
Easy
PracticeVideo
Replace Words
Medium
PracticeVideo
Map Sum Pairs
Medium
PracticeVideo
Smallest Common Region
Medium
PracticeVideo
Groups of Strings
Hard
PracticeVideo
Construct String with Minimum Cost
Hard
PracticeVideo
Edit Distance
Hard
PracticeVideo
Regular Expression Matching
Hard
PracticeVideo
Wildcard Matching
Hard
PracticeVideo
Longest Common Subsequence
Medium
PracticeVideo
Word Break
Medium
PracticeVideo
Special Binary String
Hard
PracticeVideo
Find All Good Strings
Hard
PracticeVideo
Check if an Original String Exists Given Two Encoded Strings
Hard
PracticeVideo
Apply Operations to Make Two Strings Equal
Medium
PracticeVideo
Minimum Cost Good Caption
Hard
PracticeVideo
Reorganize String
Medium
PracticeVideo
Remove K Digits
Medium
PracticeVideo
Longest Happy String
Medium
PracticeVideo
Split Concatenated Strings
Medium
PracticeVideo
Break a Palindrome
Medium
PracticeVideo
Increasing Decreasing String
Easy
PracticeVideo
Smallest String With A Given Numeric Value
Medium
PracticeVideo
Maximum Binary String After Change
Medium
PracticeVideo
Construct String With Repeat Limit
Medium
PracticeVideo
Lexicographically Smallest String After Operations With Constraint
Medium
PracticeVideo
Maximum Number of Potholes That Can Be Fixed
Medium
PracticeVideo
Is Subsequence
Easy
PracticeVideo
Longest Increasing Subsequence
Medium
PracticeVideo
Longest String Chain
Medium
PracticeVideo
Number of Valid Words for Each Puzzle
Hard
PracticeVideo
Smallest K-Length Subsequence With Occurrences of a Letter
Hard
PracticeVideo
Longest Ideal Subsequence
Medium
PracticeVideo
Longest Unequal Adjacent Groups Subsequence I
Easy
PracticeVideo
Longest Unequal Adjacent Groups Subsequence II
Medium
PracticeVideo
Palindrome Pairs
Hard
PracticeVideo
Text Justification
Hard
PracticeVideo
Find Closest Palindrome
Hard
PracticeVideo
Minimum Insertions to Make Palindrome
Hard
PracticeVideo
Additive Number
Medium
PracticeVideo
Largest Time for Given Digits
Easy
PracticeVideo
Before and After Puzzle
Medium
PracticeVideo
Synonymous Sentences
Medium
PracticeVideo
Hexspeak
Easy
PracticeVideo
Encode Number
Easy
PracticeVideo
Plates Between Candles
Medium
PracticeVideo
Minimum Number of Steps to Make Two Strings Anagram II
Medium
PracticeVideo
Reward Top K Students
Medium
PracticeVideo
Count Anagrams
Hard
PracticeVideo
Apply Bitwise Operations to Make Strings Equal
Medium
PracticeVideo
Number of Divisible Substrings
Medium
PracticeVideo
Maximize the Number of Partitions After Operations
Hard
PracticeVideo
Maximum Points Inside the Square
Medium
PracticeVideo
Smallest Divisible Digit Product II
Hard
PracticeVideo
Count K-Reducible Numbers Less Than N
Hard
PracticeVideo
Frequencies of Shortest Supersequences
Hard
PracticeVideo
Check If Digits Are Equal in String After Operations II
Hard
PracticeVideo
Sum of Largest Prime Substrings
Hard
Video
Minimum Number of Operations to Make String Sorted
Hard
PracticeVideo
Shortest Uncommon Substring in an Array
Medium
PracticeVideo