Find the first bad version of a product.

Find the missing number.

Find the maximum product of two elements in an array.

Determine if a number is an ugly number.

Add the digits in an integer.

Find all paths from root to leaf in a Binary Tree.

Determine if one string is an anagram of another.

Determine if a Linked List is a Palindrome.

Determine whether a number is a power of 2.

Find the maximum product of the three largest numbers.

Find all the ranges in a sorted array.

Invert a Binary Tree.

Determine if an array contains duplicate elements within a certain window.

Determine if an array contains a duplicate.

Reverse the elements of a Linked List.

Find the maximum possible product of two digits in an integer.

Determine if two strings are isomorphic.

Remove elements of a Linked List that are equal to a certain value.

Determine if a number is happy.

Find the number of set bits in an integer.