北叶青藤

摘要： Given a list accounts, each element accounts[i] is a list of strings, where the first element accounts[i][0] is a name, and the rest of the elements a 阅读全文

摘要： In an infinite chess board with coordinates from -infinity to +infinity, you have a knight at square [0, 0].A knight has 8 possible moves it can make, 阅读全文