分相离,内含,想交三种情况讨论一下. 主要是精度和数据范围的问题,首先数据用long double,能用整型判断就不要用浮点型. 题目中所给的坐标,半径是整型的,出现卡浮点判断的情况还是比较少的. 最后算三角型面积的时候不要用海伦公式,有四个连乘很容易爆数据范围损失精度,即使拆开两两乘也要考虑符号 (取对数也是比较好的办法).(不知道sqrt和cos,sin的精度如何比较 #include<bits/stdc++.h> using namespace std; typedef long dou…

D. Area of Two Circles' Intersection time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given two circles. Find the area of their intersection. Input The first line contains three int…

题意:求相交圆的面积.借鉴大神代码,精度超高. #include <fstream> #include <iostream> #include <string> #include <complex> #include <math.h> #include <set> #include <vector> #include <map> #include <queue> #include <stdio…

BZOJ挂了....明天就要出发去GDKOI了....不能弃疗. 于是在cf水了几道题, 写写详(jian)细(dan)题解, 攒攒RP, 希望GDKOI能好好发挥.......  620E. New Year Tree 题目大意: N个结点的树, 结点1为根, 要支持2种操作(M个操作): 1.将以v为根的子树所有节点的颜色为c 2.询问以v为根的子树中不同颜色个数 N,M<=4*10^5, 1<=c<=60 题解: 处理出dfs序, 线段树维护. 1,2操作都对应线段树的一段区间(子…

600A - Extract Numbers    20171106 字符串处理题,稍微注意点细节就能水过 #include<stdlib.h> #include<stdio.h> #include<math.h> #include<vector> #include<cstring> #include<iostream> #include<algorithm> using namespace std; string s;i…

转载自Jiaxing / 2014年2月22日 基本原理 Trilateration(三边测量)是一种常用的定位算法: 已知三点位置 (x1, y1), (x2, y2), (x3, y3) 已知未知点 (x0, y0) 到三点距离 d1, d2, d3 以 d1, d2, d3 为半径作三个圆,根据毕达哥拉斯定理,得出交点即未知点的位置计算公式: ( x1 - x0 )2 + ( y1 - y0 )2 = d12 ( x2 - x0 )2 + ( y2 - y0 )2 = d22 ( x3 -…

  形状比较语言, 九交模型 In this topic About shape comparison language Dimensionality Extensions to the CBM SCL syntactical Dimension functions DIM function form 1 DIM function form 2 Spatial relationship functions and expressions TOUCH spatial relation CROSS…

Problem Description Math is important!! Many students failed in 2+2’s mathematical test, so let's AC this problem to mourn for our lost youth..Look this sample picture: A ellipses in the plane and center in point O. the L,R lines will be vertical thr…

A Statistical View of Deep Learning (IV): Recurrent Nets and Dynamical Systems Recurrent neural networks (RNNs) are now established as one of the key tools in the machine learning toolbox for handling large-scale sequence data. The ability to specify…

Ellipse Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1868    Accepted Submission(s): 792 Problem Description Math is important!! Many students failed in 2+2’s mathematical test, so let's AC t…