http://poj.org/problem?id=2060
#include <memory.h>
#include <stdio.h>
#include <math.h>
#define null 0
#define y1 yy1
const int size = 510;
//size must be bigger than n and m.
//nС��mʱЧ�ʸ�
int maxmatch( int n, int m, bool w[][size], int *p)
{
int p_n[size];
int p_m[size];
bool sign[size];
int q[size],from[size],s,t;
int i,j,link,now,h;
memset( p_n, -1, sizeof(int)*n );
memset( p_m, -1, sizeof(int)*m );
for(i=0;i<n;i++)
if(p_n[i]==-1)
{
memset( sign, 0, sizeof(bool)*m );
s=1;link=-1;
from[0]=-1;
q[0]=size-1;
p_m[size-1]=i;
for(t=0;t<s;t++)
{
now=q[t];
for(j=0;j<m;j++)
{
if( w[p_m[now]][j] != null && sign[j]==0 )
{
sign[j]=1;
q[s]=j;
from[s++]=t;
if(p_m[j]==-1)
{
link=s-1;
break;
}
}
}
if(j<m)break;
}
if(t<s)
{
while(from[link]!=-1)
{
h=from[link];
p_m[q[link]]=p_m[q[h]];
p_n[p_m[q[h]]]=q[link];
link=h;
}
}
//���걸ƥ��
//else return 0;
}
int an;
for(i=0,an=0;i<n;i++)
{
if(p)p[i]=p_n[i];
if(p_n[i]>=0)an++;
}
return an;
}
bool e[size][size];
int begin[size], end[size];
int x1[size], y1[size], x2[size], y2[size], n;
inline int dis( int x1, int y1, int x2, int y2 )
{
return abs( x1 - x2 ) + abs( y1 - y2 );
}
int main()
{
int cas, n, i, j, a, b;
scanf( "%d", &cas );
while( cas-- )
{
memset( e, 0, sizeof e );
scanf( "%d", &n );
for( i=0; i<n; i++ )
{
scanf( "%d:%d %d %d %d %d", &a, &b, x1+i, y1+i, x2+i, y2+i );
begin[i] = a*60 + b;
end[i] = begin[i] + dis( x1[i], y1[i], x2[i], y2[i] );
}
for( i=0; i<n; i++ )
for( j=i+1; j<n; j++ )
if( end[i] + dis( x2[i], y2[i], x1[j], y1[j] ) < begin[j] )
e[i][j] = true;
printf( "%dn", n - maxmatch( n, n, e, 0 ) );
}
return 0;
}