Lewisr

摘要： Compare Version Numbers: Compare two version numbers version1 and version2.If version1 > version2 return 1, if version1 b) return 1; if(a<b) return -1; } return 0; ... 阅读全文

摘要： Valid Parentheses:Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The brackets m... 阅读全文