hdu 6699 Block Breaker BFS

每次从敲掉的位置开始bfs就行了,因为敲掉一个方块,只会直接影响其周边的方块,一层层bfs就能找出所有的跌落方块。

 1 #include <cstdio>
 2 #include <queue>
 3 using namespace std;
 4 queue <int> que[2];
 5 int n,m,q,T;
 6 int mx[] = {-1,1,0,0},my[] = {0,0,-1,1};
 7 bool hav[2050][2050];
 8 bool drp(int nx,int ny)
 9 {
10     if (hav[nx][ny] == false)
11         return false;
12     if (nx > n || nx < 1 || ny > m || ny < 1)
13         return false;
14     if ((hav[nx - 1][ny] && hav[nx + 1][ny]) || (hav[nx][ny - 1] && hav[nx][ny + 1]))
15         return false;
16     return true;
17 }
18 int bfs(int sx,int sy)
19 {
20     if (hav[sx][sy] == false)
21         return 0;
22     int res = 1;
23     que[0].push(sx);
24     que[1].push(sy);
25     hav[sx][sy] = false;
26     while (que[0].empty() == false)
27     {
28         int tx = que[0].front();
29         int ty = que[1].front();
30         que[0].pop();
31         que[1].pop();
32         for (int i = 0;i <= 3;i++)
33         {
34             int nx = tx + mx[i];
35             int ny = ty + my[i];
36             if (drp(nx,ny) == true)
37             {
38                 hav[nx][ny] = false;
39                 res++;
40                 que[0].push(nx);
41                 que[1].push(ny); 
42             }
43         }
44     }
45     return res;
46 }
47 int main()
48 {
49     for (scanf("%d",&T); T != 0; T--)
50     {
51         scanf("%d%d%d",&n,&m,&q);
52         for (int i = 0;i <= n + 1;i++)
53             for (int j = 0;j <= m + 1;j++)
54                 hav[i][j] = true;
55         int tx,ty;
56         for (int i = 1; i <= q; i++)
57         {
58             scanf("%d%d",&tx,&ty);
59             printf("%d\n",bfs(tx,ty));
60         }
61     }
62     return 0;
63 }

 

posted @ 2019-08-28 09:05  IAT14  阅读(166)  评论(0编辑  收藏  举报