说明：  一个月挑战C++,千里之行始于足下，路虽然很长，困难也会很多，不过你一旦入门，一定会觉得面前豁然开朗，会不段的激励着你学习下去的。
(month challenge, a journey of a thousand miles begins with the first step, while the road is very long, a lot of difficulties, but once you entry, will find a gleam before, not of inspired you to learn to move on.)