热带雨林

摘要： Given a string s, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them causing the left and the right side 阅读全文

摘要： Given a string s, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them causing the left and the right side 阅读全文

摘要： You are given a nested list of integers nestedList. Each element is either an integer or a list whose elements may also be integers or other lists. Im 阅读全文

摘要： Given two integers n and k, you need to construct a list which contains n different positive integers ranging from 1 to n and obeys the following requ 阅读全文

摘要： In an alien language, surprisingly they also use english lowercase letters, but possibly in a different order. The order of the alphabet is some permu 阅读全文

摘要： You are given a string s of even length. Split this string into two halves of equal lengths, and let a be the first half and b be the second half. Two 阅读全文

摘要： We have some permutation A of [0, 1, ..., N - 1], where N is the length of A. The number of (global) inversions is the number of i < j with 0 <= i < j 阅读全文

摘要： You are given an array prices where prices[i] is the price of a given stock on the ith day, and an integer fee representing a transaction fee. Find th 阅读全文

摘要： TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com/problems/design-tinyurl and it returns a short URL such as http 阅读全文

摘要： You are given the head of a linked list, and an integer k. Return the head of the linked list after swapping the values of the kth node from the begin 阅读全文