Balloons(DFS)
http://acm.sdut.edu.cn/sdutoj/problem.php?action=showproblem&problemid=2248
题意:(1)求图中四连块(有公共边的方块)的个数;
(2)求图中八连块(有公共顶点的方块)的个数。
#include<stdio.h>
#include<string.h>
const int N = ;
int vis1[N][N],map[N][N],vis[N][N];
void dfs1(int x,int y)//搜索四个方向
{
if (!map[x][y]||vis1[x][y])
return ;
vis1[x][y] = ;
dfs1(x-,y);
dfs1(x+,y);
dfs1(x,y-);
dfs1(x,y+);
}
void dfs(int x,int y)//搜索八个方向
{
if(!map[x][y]||vis[x][y])
return ;
vis[x][y] =;
dfs(x-,y-);dfs(x-,y);dfs(x-,y+);
dfs(x,y-); dfs(x,y+);
dfs(x+,y-);dfs(x+,y);dfs(x+,y+); }
int main()
{
int n,i,j,o = ;
char s[N];
while(~scanf("%d",&n)&&n)
{
++o;
int cnt1 = ;
int cnt2 = ;
memset(vis1,,sizeof(vis));
memset(vis,,sizeof(vis));
memset(map,,sizeof(map));
for (i = ; i < n; i ++)
{
scanf("%s",s);
for (j = ; j < n; j ++)
{
map[i+][j+] = s[j]-'';//在图周围加一圈空格,防止判断时越界
}
}
for (i = ; i <= n; i ++)
{
for (j = ; j <= n; j ++)
{
if (map[i][j]&&!vis1[i][j])
{
cnt1++;
dfs1(i,j); }
if (map[i][j]&&!vis[i][j])
{
cnt2++;
dfs(i,j);
} }
}
printf("Case %d: %d %d\n\n",o,cnt1,cnt2);
}
return ;
}
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