String

Given a sorted dictionary of alien language, find the order of characters in the alien alphabet

Generate the nth term of the count-and-say sequence.

Decode a string encoded with the format k[encoded_string].

Find the longest common prefix string amongst an array of strings.

Find the longest palindromic substring in a given string

Find the longest substring that appears at least twice in a string

Find the length of the longest substring without repeating characters

Find minimum insertions needed to balance parentheses string

Find the minimum window substring that contains all characters of another string

Implement regular expression matching with support for '.' and '*'

Remove k digits from a number to make it as small as possible

Reorganize string so no two adjacent characters are the same

Reverse a string in-place using O(1) extra memory.

Find the smallest substring that contains all characters of a given pattern

Sort characters in string by frequency using heap or bucket sort

Compress a string by replacing consecutive characters with character and count.

Determine if two strings are anagrams of each other

Determine if the input string has valid brackets that are properly opened and closed

Check if a string containing only parentheses is valid.

Determine if a string can be segmented into space-separated words from a dictionary.