【HDOJ】2579 Dating with girls(2)

 1 /* 2579 */
 2 #include <iostream>
 3 #include <queue>
 4 #include <cstdio>
 5 #include <cstring>
 6 #include <cstdlib>
 7 using namespace std;
 8 
 9 #define MAXN 105
10 
11 typedef struct node_t {
12     int x, y, t;
13     node_t() {}
14     node_t(int xx, int yy, int tt) {
15         x = xx; y = yy; t = tt;
16     }
17 } node_t;
18 
19 int n, m, b;
20 bool visit[MAXN][MAXN][10];
21 char map[MAXN][MAXN];
22 node_t beg;
23 int dir[4][2] = {
24     -1,0,1,0,0,-1,0,1
25 };
26 
27 inline bool check(int x, int y) {
28     return x<0 || x>=n || y<0 || y>=m;
29 }
30 
31 int bfs() {
32     int i, j, k;
33     int x, y, t;
34     node_t nd;
35     queue<node_t> Q;
36     
37     memset(visit, false, sizeof(visit));
38     visit[beg.x][beg.y][0] = true;
39     Q.push(beg);
40     
41     while (!Q.empty()) {
42         nd = Q.front();
43         Q.pop();
44         t = nd.t + 1;
45         k = t%b;
46         for (i=0; i<4; ++i) {
47             x = nd.x + dir[i][0];
48             y = nd.y + dir[i][1];
49             if (check(x,y) || visit[x][y][k])
50                 continue;
51             if (k && map[x][y]==‘#‘)
52                 continue;
53             if (map[x][y] == ‘G‘)
54                 return t;
55             visit[x][y][k] = true;
56             Q.push(node_t(x, y, t));
57         }
58     }
59     
60     return -1;
61 }
62 
63 int main() {
64     int t;
65     int i, j, k;
66     
67     #ifndef ONLINE_JUDGE
68         freopen("data.in", "r", stdin);
69         freopen("data.out", "w", stdout);
70     #endif
71     
72     beg.t = 0;
73     scanf("%d", &t);
74     while (t--) {
75         scanf("%d %d %d", &n,&m,&b);
76         for (i=0; i<n; ++i) {
77             scanf("%s", map[i]);
78             for (j=0; j<m; ++j) {
79                 if (map[i][j] == ‘Y‘) {
80                     beg.x = i;
81                     beg.y = j;
82                 }
83             }
84         }
85         k = bfs();
86         if (k < 0)
87             puts("Please give me another chance!");
88         else
89             printf("%d\n", k);
90     }
91     
92     return 0;
93 }