2799651_pe.c

北大大牛代码 1240道题的原代码 超级权威

#include <stdio.h>
#include <string.h>
#include <math.h>
#define PI 3.141592653589793
#define R 6378.0

struct node
{
	double a, b;
	char name[31];
}city[101];

int n;

int get_id(char str[])
{
	int i;

	for(i = 0; i < n; i++)
		if(strcmp(str,city[i].name)==0)
			return i;
	return -1;
}

int main()
{
	char a[31], b[31];
	int l, r;
	double a1, b1, c1, d1, D;
	
	n = 0;
	while(scanf("%s",city[n].name)==1)
	{
		if(city[n].name[0]=='#')
			break;
		scanf("%lf%lf",&city[n].a,&city[n].b);
		n++;
	}
	while(scanf("%s%s",a,b)==2)
	{
		if(a[0]=='#')
			break;
		printf("%s - %s\n",a,b);
		l = get_id(a);
		r = get_id(b);
		if(l==-1||r==-1)
		{
			puts("Unknown");
			printf("\n");
			continue;
		}
		a1 = city[l].a*PI/180;
		b1 = city[l].b*PI/180;
		c1 = city[r].a*PI/180;
		d1 = city[r].b*PI/180;
		D = acos(sin(a1)*sin(c1)+(cos(a1)*cos(c1)*cos(fabs(b1-d1))))*R;
		printf("%.0lf  km\n\n",D);
	}
	return 0;
}