先做个标题党，骗骗访问量，结束后再来写咯。
codeforces 579A Raising Bacteria
codeforces 579B Finding Team Member
codeforces 579C A Problem about Polyline
codeforces 579D "Or" Game
codeforces 579E Weakness and Poorness
codeforces 579F LCS Again
Codeforces Round#320 Div2 解题报告
原文：http://www.cnblogs.com/macinchang/p/4815061.html