Strings

 Valid Anagram (LeetCode #242)

Longest Palindromic Substring (LeetCode #5)

Palindrome Number (LeetCode #9)

Implement strStr() (LeetCode #28)

String to Integer (atoi) (LeetCode #8)

Count and Say (LeetCode #38)

Longest Common Prefix (LeetCode #14)

Reverse String (LeetCode #344)

Reverse Words in a String (LeetCode #151)

First Unique Character in a String (LeetCode #387)

Valid Parentheses (LeetCode #20)

Add Binary (LeetCode #67)

Longest Substring Without Repeating Characters (LeetCode #3)

Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree (LeetCode #1430)

Group Anagrams (LeetCode #49)

String Matching in an Array (LeetCode #1408)

Alternating Characters (HackerRank)

Sherlock and the Valid String (HackerRank)

Special String Again (HackerRank)

Common Child (HackerRank)

String Compression (LeetCode #443)

String to Integer (atoi) (LeetCode #8)

Valid Palindrome (LeetCode #125)

Implement strstr() (LeetCode #28)