摘要：In LeetCode Store, there are n items to sell. Each item has a price. However, there are some special offers, and a special offer consists of one or mo 阅读全文

摘要：You are given the array paths, where paths[i] = [cityAi, cityBi] means there exists a direct path going from cityAi to cityBi. Return the destination 阅读全文

摘要：Given an integer num, return a string representing its hexadecimal representation. For negative integers, two’s complement method is used. All the let 阅读全文