zoj 1203 Swordfish【prim】

//zoj1203

你们什么都没看到。。。下边的都是错觉，是错觉，错觉，嗯、、、、、、

  
  
  
  
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>
#include <algorithm>
#define  INT_MAXl 2100000000
using namespace std;
int n;
double map[101][101], v[101][2], lmin[101];
int next[101];
bool flag[101];
int find_min(int x)
{
	int i;
	lmin[x] = INT_MAXl;
	int _next = x;
	for(i=0; i<n; i++)
		if(flag[i] && map[x][i] < lmin[x])
		{
		 	lmin[x] = map[x][i];
			_next = i;
		}
	return _next;
}

int main()
{
	int i, j, cases=0; 
	double p, q, ans;
	scanf("%d", &n);
	while( n)
	{
		if( !n )break;
		ans = 0;
		for(i=0; i<n; i++)
			scanf("%lf%lf", &v[i][0], &v[i][1]);
		for(i=0; i<n; i++)
			for(j=i+1; j<n; j++)
			{
				p = v[i][0] - v[j][0];
				q = v[i][1] - v[j][1];
				map[j][i] = map[i][j] = sqrt(p * p + q * q);
			}
		memset(flag, true, sizeof(flag) );
		flag[0] = false;
		int latest;
		double w_min;
		while(1)
		{
			w_min = INT_MAXl;
			latest = -1;
			for(i=0; i<n; i++)
			{
				if( flag[i] == false)
				{
					next[i] = find_min(i);
					if(next[i] != i && w_min > lmin[i] )
					{
						w_min = lmin[i];
						latest = next[i];
					}
				}
			}
			if( latest == -1)
				break;
			flag[ latest ] = false;
			ans += w_min;
		}
		printf("Case #%d:\nThe minimal distance is: %.2lf\n", ++cases, ans);
		scanf("%d", &n);
		if(n)printf("\n");
	}
    return 0;
}

2604335	2011-07-29 08:50:20	Presentation Error	1203	C++	0	264	ylwh!
2604330	2011-07-29 08:42:52	Presentation Error	1203	C++	0	264	ylwh!
2604328	2011-07-29 08:34:57	Presentation Error	1203	C++	0	264	ylwh!
2602919	2011-07-28 08:28:32	Wrong Answer	1203	C++	0	264	ylwh!
2602918	2011-07-28 08:28:24	Compilation Error	1203	C	0	0	ylwh!
2602718	2011-07-27 21:45:10	Wrong Answer	1203	C++	0	264	ylwh!
2602715	2011-07-27 21:44:43	Compilation Error	1203	C	0	0	ylwh!
2602563	2011-07-27 20:14:27	Wrong Answer	1203	C++	0	264	ylwh!
2602556	2011-07-27 20:12:16	Compilation Error	1203	C++	0	0	ylwh!
2602548	2011-07-27 20:10:05	Compilation Error	1203	C++	0	0	ylwh!
2602432	2011-07-27 19:06:07	Wrong Answer	1203	C++	0	264	ylwh!
2602422	2011-07-27 18:58:57	Wrong Answer	1203	C++	0	220	ylwh!
2602421	2011-07-27 18:58:44	Compilation Error	1203	C	0	0	ylwh!

第一个最小生成树、、、