摘要：git国内访问较慢，走代理较快。 方法：git config --global http.proxy http://proxyuser:proxypwd@proxy.server.com:port_number（有用户和密码） git config --global http.proxy http: 阅读全文

摘要：Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the leng 阅读全文