poj1418 Viva Confetti 判断圆是否可见

【poj1418 Viva Confetti 判断圆是否可见】的更多相关文章

poj1418 Viva Confetti 判断圆是否可见

转载请注明出处: http://www.cnblogs.com/fraud/ ——by fraud Viva Confetti Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 881 Accepted: 361 Description Do you know confetti? They are small discs of colored paper, and people throw them a…

poj 1418 Viva Confetti

Viva Confetti Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 1025 Accepted: 422 Description Do you know confetti? They are small discs of colored paper, and people throw them around during parties or festivals. Since people throw lots…

ZOJ 1696 Viva Confetti 计算几何

计算几何:按顺序给n个圆覆盖.问最后能够有几个圆被看见.. . 对每一个圆求和其它圆的交点,每两个交点之间就是可能被看到的圆弧,取圆弧的中点,往外扩展一点或者往里缩一点,从上往下推断有没有圆能够盖住这个点,能盖住这个点的最上面的圆一定是可见的 Viva Confetti Time Limit: 2 Seconds Memory Limit: 65536 KB Do you know confetti? They are small discs of colored paper, and…

uva 1308 - Viva Confetti

这个题目的方法是将圆盘分成一个个圆环,然后判断这些圆环是否被上面的圆覆盖: 如果这个圆的圆周上的圆弧都被上面的覆盖,暂时把它标记为不可见: 然后如果他的头上有个圆,他有个圆弧可见,那么他自己本身可见,并且可以把这条圆弧下面的第一个圆重新标记为可见: 另外,圆弧可见还是不可见利用它的中点来进行判断: #include <cstdio> #include <cmath> #include <cstring> #include <algorithm> #inclu…

A Round Peg in a Ground Hole - POJ 1584 (判断凸多边形&判断点在多边形内&判断圆在多边形内)

题目大意:首先给一个圆的半径和圆心,然后给一个多边形的所有点(多边形按照顺时针或者逆时针给的),求,这个多边形是否是凸多边形,如果是凸多边形在判断这个圆是否在这个凸多边形内. 分析:判断凸多边形可以使用相邻的三个点叉积判断,因为不知道顺时针还是逆时针,所以叉积如果有有整数和负数,那么一定不是凸多边形(注意允许多多点在一条线段上).判断圆在凸多边形首先要判断圆心是否在多边形内,如果在多边形内,再次判断圆心到达到变形每条边的最短距离,如果小于半径就是不合法.ps:一道好题,通过这个题学会了不少东…

判断圆和矩形是否相交C - Rectangle and Circle

Description Given a rectangle and a circle in the coordinate system(two edges of the rectangle are parallel with the X-axis, and the other two are parallel with the Y-axis), you have to tell if their borders intersect. Note: we call them intersect ev…