SDUT 2410 Mine Number(DFS)

题目链接

省赛的D题。。。。一年前的题目了。。。思路早就问过侯神了，就是讨论各种情况。。。早就想写一下，一直拖着。。今天乱写了一下。。终于过了。。写的太繁琐了，而且出现BUG了过不了样例，又加了一个判断，过了样例就AC了。。。

  1 #include <cstdio>
  2 #include <cstring>
  3 #include <cmath>
  4 #include <queue>
  5 using namespace std;
  6 int o[51][51],n,m,z;
  7 int a[4] = {0,0,1,-1};
  8 int b[4] = {1,-1,0,0};
  9 char p[31][31];
 10 int judge(int x,int y)
 11 {
 12     int i,t = 0;
 13     if(o[x][y])
 14     t ++;
 15     for(i = 0;i < 4;i ++)
 16     {
 17         if(x+a[i] >= 0&&x+a[i] < n&&y+b[i] >= 0&&y+b[i] < m)
 18         {
 19             if(o[x+a[i]][y+b[i]])
 20             t ++;
 21         }
 22     }
 23     if(t == p[x][y]-'0')
 24     return 1;
 25     else
 26     return 0;
 27 }
 28 void dfs(int x,int y)
 29 {
 30     int i,j,r,c,num,temp;
 31     if(x-2 >= 0)//判断一下已知的点是否符合
 32     {
 33         if(!judge(x-2,y))
 34         return ;
 35     }
 36     if(x == n)
 37     {
 38         z = 1;
 39         for(i = 0;i < n;i ++)
 40         {
 41             for(j = 0;j < m;j ++)
 42             {
 43                 if(o[i][j])
 44                 printf("*");
 45                 else
 46                 printf(".");
 47             }
 48             printf("\n");
 49         }
 50     }
 51     if(z) return ;
 52     if(y+1 == m)
 53     {
 54         r = x+1;
 55         c = 0;
 56     }
 57     else
 58     {
 59         r = x;
 60         c = y + 1;
 61     }
 62     if(x == n-1)
 63     {
 64         if(judge(x,y))
 65         dfs(r,c);
 66     }
 67     else if(o[x][y] != -1)
 68     {
 69         num = 0;
 70         temp = p[x][y] - '0';
 71         if(x-1 >= 0)
 72         num += o[x-1][y];
 73         if(y-1 >= 0)
 74         num += o[x][y-1];
 75         if(o[x][y])
 76         num ++;
 77         if(num > temp)
 78         return ;
 79         else if(num == temp)
 80         {
 81             o[x][y+1] = 0;
 82             o[x+1][y] = 0;
 83             if(judge(x,y))
 84             dfs(r,c);
 85         }
 86         else if(temp - num == 1)
 87         {
 88             o[x][y+1] = 1;
 89             o[x+1][y] = 0;
 90             if(judge(x,y))
 91             dfs(r,c);
 92             o[x][y+1] = 0;
 93             o[x+1][y] = 1;
 94             if(judge(x,y))
 95             dfs(r,c);
 96         }
 97         else if(temp - num == 2)
 98         {
 99             o[x][y+1] = 1;
100             o[x+1][y] = 1;
101             if(judge(x,y))
102             dfs(r,c);
103         }
104     }
105     else
106     {
107         num = 0;
108         temp = p[x][y] - '0';
109         if(x-1 >= 0)
110         num += o[x-1][y];
111         if(y-1 >= 0)
112         num += o[x][y-1];
113         if(num > temp)
114         return ;
115         else if(num == temp)
116         {
117             o[x][y] = 0;
118             o[x][y+1] = 0;
119             o[x+1][y] = 0;
120             if(judge(x,y))
121             dfs(r,c);
122         }
123         else if(temp - num == 1)
124         {
125             o[x][y] = 1;
126             o[x][y+1] = 0;
127             o[x+1][y] = 0;
128             if(judge(x,y))
129             dfs(r,c);
130             o[x][y] = 0;
131             o[x][y+1] = 1;
132             o[x+1][y] = 0;
133             if(judge(x,y))
134             dfs(r,c);
135             o[x][y] = 0;
136             o[x][y+1] = 0;
137             o[x+1][y] = 1;
138             if(judge(x,y))
139             dfs(r,c);
140         }
141         else if(temp - num == 2)
142         {
143             o[x][y] = 1;
144             o[x][y+1] = 1;
145             o[x+1][y] = 0;
146             if(judge(x,y))
147             dfs(r,c);
148             o[x][y] = 1;
149             o[x][y+1] = 0;
150             o[x+1][y] = 1;
151             if(judge(x,y))
152             dfs(r,c);
153             o[x][y] = 0;
154             o[x][y+1] = 1;
155             o[x+1][y] = 1;
156             if(judge(x,y))
157             dfs(r,c);
158         }
159         else if(temp - num == 3)
160         {
161             o[x][y] = 1;
162             o[x][y+1] = 1;
163             o[x+1][y] = 1;
164             if(judge(x,y))
165             dfs(r,c);
166         }
167     }
168     return ;
169 }
170 int main()
171 {
172 
173     int t,i,num = 0;
174     scanf("%d",&t);
175     while(t--)
176     {
177         z = 0;
178         num ++;
179         scanf("%d%d",&n,&m);
180         memset(o,-1,sizeof(o));
181         for(i = 0; i < n; i ++)
182         scanf("%s",p[i]);
183         printf("Case %d:\n",num);
184         dfs(0,0);
185     }
186     return 0;
187 }
188 /*
189 3
190 2 2
191 21
192 21
193 */

 

posted @ 2013-02-27 15:03  Naix_x  阅读(270)  评论(0)    收藏  举报