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Tom and Jerry are very fond of cat and mice games, which might be rather obvious to you. Today theyare playing a very complicated game. The goals are simple as usual though, Jerry would be running

本文来源于武功盖世的戴老板http://blog.youkuaiyun.com/deaidai/article/details/75845516这个判断一个点是否在三角形内涉及到了初中高中的几何知识，由于本人数学功底不好，所以在训练时一筹莫展，赛后补题。面积法如果点P在三角形ABC内，那么，三角形ABC的面积可以分解为三个小三角形PAB,PBC,PAC的面积之和，如果不在三角形内则

题目链接：https://vjudge.net/contest/173017#problem/E题意：已知两个点确定一个无限长的直线（墙），狗链一端拴在原点，求狗链至少要多长能使守卫的面积大于等于L.思路：当狗链小于等于原点到直线距离L1时，守卫面积为整圆. 大于L1时，守卫面积为扇形加三角形面积。三角形面积公式：   S=1/2*d*h（底*高*二分之一）扇形面积公式：

Time Limit: 1000 mSec    Memory Limit : 262144 KB Problem DescriptionKim likes to play Tic-Tac-Toe.Given a current state, and now Kim is going to take his next move. Please tell Kim if he ca

小D的家A和学校B都恰好在以点F为焦点的双曲线上，而小D每日所需的生活水源在一条平行该双曲线准线的直线上，设它的值为v。大家都知道，每天都是要喝水的，但是小D有点懒，他希望自己能在去上学或者回家的时候顺路打桶水，并且走最短的路，你能帮助他吗？下图所示样例的情况，已知焦点在x轴上，那么其准线垂直x轴，即x=v，故可作出河流所在直线如图，那么最优路线为从家A到点C（0，5.8888889）取水，然后再

Problem StatementYou are given two integers A and B.Print a grid where each square is painted white or black that satisfies the following conditions, in the format specified in Output section:Let the ...

Problem DescriptionEdward is a worker for Aluminum Cyclic Machinery. His work is operating mechanical arms to cut out designed models. Here is a brief introduction of his work.Assume the operating ...

Time Limit: 4000/4000 MS (Java/Others)    Memory Limit: 512000/512000 K (Java/Others)Total Submission(s): 1791    Accepted Submission(s): 686 Problem DescriptionMatt is a big fan of logo design....