The Tower HDU - 6559 The Tower shows a tall tower perched on the top of a rocky mountain. Lightning strikes, setting the building alight, and two people leap from the windows, head first and arms outstretched. It is a scene of chaos and destruction.*…

传送门:HDU - 6559 题意 在一个三维空间,给定一个点和他的三维速度,给定一个圆锥,问这个点最早什么时候能撞上圆锥. 题解 本来一直想着怎么求圆锥的方程,然后....队友:这不是二分吗!然后问题就转换成了要怎么求当前时间是不是已经穿过了圆锥了....然后就gg了. 正解就是联立: ① r ' = (h-z)/h*r ② x=x0+vx*t; y=y0+vy*t; z=z0+vz*t; ③ x2+y2=r ' 2 然后就可以求解出 t 了(这个一元二次方程及其麻烦.....)不知道为啥直接…

Stupid Tower Defense Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1219    Accepted Submission(s): 361 Problem Description FSF is addicted to a stupid tower defense game. The goal of tower…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4939 解题报告:一条长度为n的线路,路上的每个单元格可以部署三种塔来给走在这条路上的敌人造成伤害,第一种塔只给在这个塔的范围内的敌人每秒造成x点的伤害,第二种塔给已经经过过这个塔的敌人每秒造成y点伤害,第三种塔能使已经经过了这个塔的敌人的前进的速度减慢,具体效果是,原来敌人经过一个单元格的时间是t秒,经过减速后,经过每个单元格的时间是t + z,这个一个塔减速的效果,减速的效果可以叠加,同样,第二种…

题意:考虑由$n$个结点构成的无向图,每条边的长度均为$1$,问有多少种构图方法使得结点$1$与任意其它节点之间的最短距离均不等于$k$(无法到达时距离等于无穷大),输出答案对$1e9+7$取模.$1 \leq n, k \leq 60$. 分析:只需要考虑那些和结点$1$在同一个连通块的结点,考虑对包含结点$1$的连通图的等价类划分:首先是结点数目,其次是所有结点到达结点$1$的最短距离的最大值,再次是最短距离等于该最大值的结点数目,因此用$dp(i, j, k)$表示与$1$在同一个连通分量…

Description Alan loves to construct the towers of building bricks. His towers consist of many cuboids with square base. All cuboids have the same height \(h = 1\). Alan puts the consecutive cuboids one over another: Recently in math class, the concep…

Hanoi Tower Troubles Again! Problem Description People stopped moving discs from peg to peg after they know the number of steps needed to complete the entire task. But on the other hand, they didn't not stopped thinking about similar puzzles with the…

Tower Defense Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 132768/132768 K (Java/Others) Total Submission(s): 474    Accepted Submission(s): 126 Problem Description DRD loves playing computer games, especially Tower Defense games. Tower De…

Problem Description Like most of the RPG (role play game), “The Magic Tower” is a game about how a warrior saves the princess. After killing lots of monsters, the warrior has climbed up the top of the magic tower. There is a boss in front of him. The…

Tower Defense Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 132768/132768 K (Java/Others)Total Submission(s): 1025    Accepted Submission(s): 297 Problem Description DRD loves playing computer games, especially Tower Defense games. Tower De…