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题意：C国的死对头A国这段时间正在进行军事演习，所以C国间谍头子Derek和他手下Tidy又开始忙乎了。A国在海岸线沿直线布置了N个工兵营地,Derek和Tidy的任务就是要监视这些工兵营地的活动情况。由于采取了某种先进的监测手段，所以每个工兵营地的人数C国都掌握的一清二楚,每个工兵营地的人数都有可能发生变动，可能增加或减少若干人手,但这些都逃不过C国的监视。中央情报局要研究敌人究

求逆序数是树状数组中比较常见的一类问题。逆序数即求某一位置之前有多少个比该位置大的数。首先求逆序数的代码：#include #include #include #include #include #include #include using namespace std;int c[100000],a[100000];int lowbit(int x){ ret

原题：DescriptionAstronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a star be an amount of the stars th

原题链接：http://acm.hdu.edu.cn/webcontest/contest_showproblem.php?pid=1020&ojid=1&cid=11842&hide=1&problem=Problem%20%20U原题：Problem DescriptionIn this problem, you have to analyze a particular

Problem DescriptionNow I am leaving hust acm. In the past two and half years, I learned so many knowledge about Algorithm and Programming, and I met so many good friends. I want to say sorry to Mr

原题：Problem DescriptionMery has a beautiful necklace. The necklace is made up of N magic balls. Each ball has a beautiful value. The balls with the same beautiful value look the same, so if t