Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such that there is a...

You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your pr...

Sort a linked list in O(n log n) time using constant space complexity. 12345678910111213141516171819202122232425262728293031...

There are N gas stations along a circular route, where the amount of gas at station i is gas[i]. You have a car with an unlim...

Given a collection of distinct numbers, return all possible permutations. For example,[1,2,3] have the following permutations...

Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the ar...

Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the ar...

Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the s...

Given a linked list, remove the nth node from the end of list and return its head. For example, 1234Given linked list: 1->...

Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters ...