摘要：
In a kindergarten, there are a lot of kids. All girls of the kids know each other and all boys also know each other. In addition to that, some girls a 阅读全文
摘要：
推荐博客 ：https://www.cnblogs.com/jianglangcaijin/p/6035945.html 推荐博客 ：https://blog.csdn.net/flynn_curry/article/details/52966283 二分图的最小顶点覆盖 定义 ： 假如选了一个顶点 阅读全文
摘要：
In Arcady's garden there grows a peculiar apple-tree that fruits one time per year. Its peculiarity can be explained in following way: there are n inf 阅读全文