- Is Unique: Implement an algorithm to determine if a string has all unique characters.
- Check Palindrome : Given 2 strings, write a method to decide if one is a permutation of the other
- URLify : Write a method to replace all spaces in a string with '%20'. You may assume that the string has sufficient space at the end to hold additional characters.
- String Comprehension : Implement a method to perform basic string compression using the counts of repeated characters. For ex: "aaaabbccc" -> "a4b2c3"
Solutions are presenet here.