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题目Problem Description An abandoned country has n(n≤100000) villages which are numbered from 1 to n. Since abandoned for a long time, the roads need to be re-built. There are m(m≤1000000) roads to be

今天在体检，没能和队友一起了，之后的多校赛都要单刷了，天朝奇怪的征兵政策，我测完视力，一群人盯着我看。。。老子是写轮眼不行吗，右眼用多了万花筒，视力下降了。吐槽就到这里了hdu 5791Problem Description Alice gets two sequences A and B. A easy problem comes. How many pair of sequence A’ a

1005 Problem Description Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he throws n balls into m boxes in such a manner tha

hdu 5821题意 给定一列球，每种球有一个颜色，同一颜色的球无区别 每次选择一个区间，任意排列其中的球 问是否能从初始的排列变成给定的一个排列思路 这题其实很水，就是一个简单的排序。。。比赛期间其实想到排序 ，然而当时感觉把多余的往后排就好。。然而。。。其实这题因为操作是有顺序的，每次操作都要把位置定下来。而且，很重要的一点，颜色一样的都是没区别的。所以同样颜色的在前