摘要：You have an array of . Each log is a space delimited string of words. For each log, the first word in each log is an alphanumeric identifier . Then, e 阅读全文

摘要：You want to form a string of lowercase letters. At the beginning, your sequence is `'?' stamp` of lowercase letters. On each turn, you may place the s 阅读全文

摘要：The chess knight has a unique movement, it may move two squares vertically and one square horizontally, or two squares horizontally and one square ver 阅读全文