摘要：There are n people, each person has a unique id between 0 and n-1. Given the arrays watchedVideos and friends, where watchedVideos[i] and friends[i] c 阅读全文

摘要：Given an equation, represented by words on the left side and the result on the right side. You need to check if the equation is solvable under the fol 阅读全文

摘要：You are given an array arr of positive integers. You are also given the array queries where queries[i] = [lefti, righti]. For each query i compute the 阅读全文