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  • poj 2365

    http://acm.pku.edu.cn/JudgeOnline/problem?id=2365

    鄙视一下自己,净犯低级错误

    #include<stdio.h>
    #include<math.h>
    #define PI 3.141592653589
    double distance(double x1,double y1,double x2,double y2)
    {
    	return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
    }
    int main()
    {
    	int nNail,i;
    	double x[110],y[110],lineleng,radius;     //起先半径定义成了int,其实脑子里想着是double,不知怎么大脑短路了
    	while(scanf("%d%lf",&nNail,&radius)!=EOF)  //输入写成了%d,再次短路
    	{
    		lineleng = 2 * PI * radius;     //期间怕精度不够,有换成acos(double(-1))的,没想到用C提交,CE了,C++就不CE了
    		scanf("%lf%lf",&x[0],&y[0]);    //原先当nNail=1时,直接跳过输入,这也是一直WA的原因之一,看了好十几遍后才发现,其实在调试别人的程序时就觉得有点怪,他们没输出,我怎么有输出???
    		for(i = 1; i < nNail; i++)
    		{
    			scanf("%lf%lf",&x[i],&y[i]);
    			lineleng += distance(x[i-1],y[i-1],x[i],y[i]);	
    		}
    		lineleng += distance(x[0],y[0],x[nNail-1],y[nNail-1]);
    		printf("%.2lf\n",lineleng);
    	}
    	return 0; 
    }
    

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  • 原文地址:https://www.cnblogs.com/submarinex/p/1941265.html
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