URL由来: 一般来说,URL只能使用英文字母.阿拉伯数字和某些标点符号,不能使用其他文字和符号.比如,世界上有英文字母的网址 “http://www.abc.com”,但是没有希腊字母的网址“http://www.aβγ.com”(读作阿尔法-贝塔-伽玛.com).这是 因为网络标准RFC 1738 做了硬性规定: "...Only alphanumerics [0-9a-zA-Z], the special characters "$-_.+!*'()," [not in
A message containing letters fromA-Zis being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 26 Given an encoded message containing digits, determine the total number of ways to decode it. For example,Given encoded me