zoukankan      html  css  js  c++  java
  • hdoj 1071 The area

    The area

    Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
    Total Submission(s): 8388    Accepted Submission(s): 5888


    Problem Description
    Ignatius bought a land last week, but he didn't know the area of the land because the land is enclosed by a parabola and a straight line. The picture below shows the area. Now given all the intersectant points shows in the picture, can you tell Ignatius the area of the land?

    Note: The point P1 in the picture is the vertex of the parabola.

     
    Input
    The input contains several test cases. The first line of the input is a single integer T which is the number of test cases. T test cases follow.
    Each test case contains three intersectant points which shows in the picture, they are given in the order of P1, P2, P3. Each point is described by two floating-point numbers X and Y(0.0<=X,Y<=1000.0).
     
    Output
    For each test case, you should output the area of the land, the result should be rounded to 2 decimal places.
     
    Sample Input
    2
    5.000000 5.000000
    0.000000 0.000000
    10.000000 0.000000
    10.000000 10.000000
    1.000000 1.000000
    14.000000 8.222222
     
    Sample Output
    33.33
    40.69
     
    就是一道数学题,做题的时候看错了一个坐标  结果看了好长时间没发现  坑~~~~
    #include<stdio.h>
    #include<math.h>
    int main()
    {
    	int N;
    	double a,b,c,d,k,x1,y1,x2,y2,x3,y3,s;
    	scanf("%d",&N);
    	while(N--)
    	{
    		s=0;
    		scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3);
    		a=((y1-y3)*(x1-x2)-(y1-y2)*(x1-x3))/((x1*x1-x3*x3)*(x1-x2)-(x1*x1-x2*x2)*(x1-x3));	
    		d=((y1-y3)-a*(x1*x1-x3*x3))/(x1-x3);
    		c=y1-a*x1*x1-d*x1;		
    		k=(y2-y3)/(x2-x3);
    		b=y3-k*x3;
    		s=((a*x3*x3*x3)/3+((d-k)*x3*x3)/2+(c-b)*x3)-((a*x2*x2*x2)/3+((d-k)*x2*x2)/2+(c-b)*x2);
    		printf("%.2lf
    ",s);
    	}
    	return 0;
    }
    

      

  • 相关阅读:
    递归要记得返回
    git push的时候报Unable to find remote helper for 'https'的错误
    iphone手机上的click和touch事件
    对jquery的conflict方法的解读
    开发富文本编辑器的一些体会
    使用jquery制作动态加载型菜单
    解决jquery$命名符和其它框架的冲突问题
    基于geolocation来获取经纬度地址
    Python学习笔记2解析数据
    Python学习笔记1数据类型
  • 原文地址:https://www.cnblogs.com/tonghao/p/4463942.html
Copyright © 2011-2022 走看看