Strings Visualizers

12

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

Find Most Frequent Vowel and Consonant
Iterate the string to build frequency maps arrays for vowels and consonants.
Frequency Maps
Find Words Containing Character
Check each string in an array and record its index if it contains a target character.
Linear Scan
Group Anagrams
Sort each string to generate a universal anagram key, using a Hash Map to group them.
Hash Map / Sorting
Isomorphic Strings
Maintain a one-to-one character mapping using two hash maps simultaneously to verify isomorphic consistency.
Two Hash Maps
Jewels and Stones
Store all jewels in a Set, then verify each stone with O(1) time complexity.
Hash Set Lookup
Largest Odd Number in a String
An integer string is odd if its last digit is odd. Scan right-to-left for the first odd digit.
Reverse Scan
Length of Last Word
Start from the end to skip trailing spaces, then count characters until the first space.
Reverse Traversal
Longest Common Prefix
Assume the first word is the prefix, then iteratively shorten it until it matches the start of the next word.
Horizontal Scanning
Reverse String II
Reverse the first k characters for every blocks of 2k characters.
Chunk Reversal
Split a String in Balanced Strings
Maintain a balance counter, increment for 'L' and decrement for 'R'. Split when balance is 0.
Running Balance
Valid Anagram
Build a hash map of character counts for s, then decrement the counts while iterating over t.
Frequency Map
Valid Palindrome
Use left and right pointers to scan inwards, skipping symbols and checking equality.
Two Pointers