Given a 2D board and a list of words from the dictionary, find all words in the board.

You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are arranged in ...

Given a singly linked list, determine if it is a palindrome.

Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two middle va...

Given a list of unique words, find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] ...

Write a program to find the nth super ugly number.

There is a table courses with columns: student and class

Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.

Given a binary tree, flatten it to a linked list in-place.

Reverse a linked list from position m to n. Do it in-place and in one-pass.