Strings - Advanced Visualizers

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Step through every Strings - Advanced problem with animated runtime state, source highlighting, and curated test cases. Built for coding-interview prep and durable algorithmic intuition.

Count and Say
Generate the nth term of the reading sequence.
Simulation
Decode String
Parse and expand iteratively nested repeating strings.
Stack
Minimum Add to Make Parentheses Valid
Find the minimum number of insertions to balance parentheses.
Greedy
Rabin Karp - Code
Find pattern matches in text using a rolling hash to avoid O(M) comparisons.
Rolling Hash
Rabin Karp Algorithm
Find pattern matches in text using a rolling hash to avoid O(M) comparisons.
Rolling Hash
Reorganize String
Rearrange a string so no two adjacent characters are the same.
Greedy / Hash Table
Repeated String Match
Find the minimum times 'a' must be repeated for 'b' to be a substring.
Matching
Reverse Words in a String
Reverse the order of words in a string, cleaning up extra spaces.
String Parsing
Sum of Beauty of All Substrings
Find the total beauty sum across all contiguous substrings.
Counting