zoj 1199 几何公式推导

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zoj 1199 几何公式推导

链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=199 Point of Intersection Time Limit: 2 Seconds Memory Limit: 65536 KB Given two circles on the same plane which are centered at (x1,y1) and (x2,y2) ,with radiuses r1 and r2, respecti…

ZOJ 3903 Ant(公式推导)

这个公式推导过程是看的这位大牛的http://blog.csdn.net/bigbigship/article/details/49123643 扩展欧几里德求模的逆元方法: #include <cstdio> #include <cstring> #include <algorithm> using namespace std; typedef long long ll; ; ll exgcd(ll a, ll b, ll &x, ll &y) { )…

多视几何——三角化求解3D空间点坐标

VINS-Mono / VINS-Fusion中triangulatePoint()函数通过三角化求解空间点坐标,代码所体现的数学描述不是很直观,查找资料,发现参考文献[1]对这个问题进行详细解释,记录笔记以备忘. 1. VINS-Mono中相关代码 void FeatureManager::triangulatePoint(Eigen::Matrix<double, 3, 4> &Pose0, Eigen::Matrix<double, 3, 4> &Pose1,…

SVM个人学习总结

SVM个人学习总结如题,本文是对SVM学习总结,主要目的是梳理SVM推导过程,以及记录一些个人理解. 1.主要参考资料 [1]Corres C. Support vector networks[J]. Machine Learning, 1995, 20(3):273-297. [2]Platt J C. Sequential Minimal Optimization: A Fast Algorithm for Training Support Vector Machines[C]// Adv…

ZOJ 2301/HDU 1199 线段树+离散化

给这个题目跪了两天了,想吐简直发现自己离散化没学好包括前一个离散化的题目,实际上是错了,我看了sha崽的博客后才知道,POJ那题简直数据弱爆了,本来随便一组就能让我WA掉的,原因在于离散化的时候,缩小数据规模的同时,没有考虑到误差,比如 1 4 6 8,离散化之后是1 2 3 4,我如果覆盖了1 2和3 4,表面上好像全部覆盖了,实际数据并没有覆盖..所以我只能说那道题目我其实错了,并没有真正做出离散化出来...现在用这道题来弥补. color the ball,ball的编号可以从1 到2…

[ACM_暴力][ACM_几何] ZOJ 1426 Counting Rectangles (水平竖直线段组成的矩形个数，暴力）

Description We are given a figure consisting of only horizontal and vertical line segments. Our goal is to count the number of all different rectangles formed by these segments. As an example, the number of rectangles in the Figures 1 and 2 are 5 and…

[ACM_几何] Transmitters (zoj 1041 ,可旋转半圆内的最多点)

Description In a wireless network with multiple transmitters sending on the same frequencies, it is often a requirement that signals don't overlap, or at least that they don't conflict. One way of accomplishing this is to restrict a transmitter's cov…