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如下:(创建一个集合p++,合并一次则p--)In Reply To:Re:并查集怎么做?我用搜索的 Posted by:hutu_2000 at 2009-04-03 10:11:43 #include <iostream>
using namespace std;
struct point{
int a,b;
};
point root[105][105];
int shifty[4]={-1,0,1,-1};
int shiftx[4]={-1,-1,-1,0};
point index(int x,int y);
void unit(point x,point y);
int main()
{
int n,m,i,j,k;
char s[105][105];
while(scanf("%d %d",&n,&m)==2&&!(n==0&&m==0))
{
int p=0;
for(i=0;i<n;i++)
scanf("%s",s[i]);
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
{
root[i][j].a=i; root[i][j].b=j;
}
}
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
{
if(s[i][j]=='@')
{
for(k=0;k<4;k++)
{
int x=shiftx[k]+i,y=shifty[k]+j;
if(x>=0&&x<n&&y>=0&&y<m)
{
if(s[x][y]=='@')
{
if(root[i][j].a==i&&root[i][j].b==j)
{
point d=index(x,y); //返回x,y的根节点
root[i][j].a=d.a; root[i][j].b=d.b;
}
else
{
point d=index(x,y);
if(!(root[i][j].a==d.a&&root[i][j].b==d.b))
{
unit(root[i][j],d); p--;
}
}
}
}
}
if(root[i][j].a==i&&root[i][j].b==j)
p++;
}
}
}
printf("%d\n",p);
}
return 0;
}
point index(int x,int y)
{
if(root[x][y].a==x&&root[x][y].b==y)
{
return root[x][y];
}
else
{
point d=index(root[x][y].a,root[x][y].b); //???
root[x][y].a=d.a; root[x][y].b=d.b;
}
return root[x][y];
}
void unit(point x,point y)
{
point d=index(y.a,y.b);
root[y.a][y.b].a=x.a; root[y.a][y.b].b=x.b;
}
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