摘要： XOR and ORDescriptionThe Bitlandians are quite weird people. They do everything differently. They have a different alphabet so they have a different definition for a string.A Bitlandish string is a string made only of characters "0" and "1".BitHaval (the mayor of Bitland) loves t 阅读全文

摘要： Web NavigationDescription Standard web browsers contain features to move backward and forward among the pages recently visited. One way to implement these features is to use two stacks to keep track of the pages that can be reached by moving backward and forward. In this problem, you are asked to im 阅读全文