• 【HDOJ】1484 Basic wall maze


    BFS。

     1 /* 1484 */
     2 #include <iostream>
     3 #include <queue>
     4 #include <string>
     5 #include <cstdio>
     6 #include <cstring>
     7 #include <algorithm>
     8 using namespace std;
     9 
    10 typedef struct {
    11     int x, y;
    12     string s;
    13 } node_t;
    14 
    15 bool m[8][8][4];
    16 bool visit[8][8];
    17 char ds[5] = "NSWE";
    18 int dir[4][2] = {
    19     -1,0,1,0,0,-1,0,1
    20 };
    21 
    22 const int n = 6;
    23 int bx, by, ex, ey;
    24 string ans;
    25 
    26 void bfs() {
    27     int x = bx, y = by;
    28     int i, j, k;
    29     queue<node_t> Q;
    30     string s;
    31     node_t nd, tmp;
    32     
    33     memset(visit, false, sizeof(visit));
    34     visit[x][y] = true;
    35     nd.x = x;
    36     nd.y = y;
    37     nd.s = "";
    38     Q.push(nd);
    39     
    40     while (!Q.empty()) {
    41         nd = Q.front();
    42         Q.pop();
    43         for (i=0; i<4; ++i) {
    44             if (m[nd.x][nd.y][i])
    45                 continue;
    46             x = nd.x + dir[i][0];
    47             y = nd.y + dir[i][1];
    48             if (x<=0 || x>6 || y<=0 || y>6 || visit[x][y])
    49                 continue;
    50             visit[x][y] = true;
    51             tmp.x = x;
    52             tmp.y = y;
    53             tmp.s = nd.s + ds[i];
    54             if (x==ex && y==ey) {
    55                 ans = tmp.s;
    56                 return ;
    57             }
    58             Q.push(tmp);
    59         }
    60     }
    61 }
    62 
    63 int main() {
    64     int i, j, k;
    65     int x, y;
    66     int a, b, c, d;
    67     
    68     #ifndef ONLINE_JUDGE
    69         freopen("data.in", "r", stdin);
    70     #endif
    71     
    72     while (scanf("%d %d",&by,&bx)!=EOF && (by||bx)) {
    73         scanf("%d %d", &ey, &ex);
    74         memset(m, false, sizeof(m));
    75         for (i=0; i<3; ++i) {
    76             scanf("%d%d%d%d", &a,&b,&c,&d);
    77             if (b == d) {
    78                 // north & south need to mask
    79                 for (y=a+1; y<=c; ++y) {
    80                     m[b][y][1] = true;
    81                     m[b+1][y][0] = true;
    82                 }
    83             } else {
    84                 // west & east need to mask
    85                 for (x=b+1; x<=d; ++x) {
    86                     m[x][a][3] = true;
    87                     m[x][a+1][2] = true;
    88                 }
    89             }
    90         }
    91         bfs();
    92         printf("%s
    ", ans.c_str());
    93     }
    94     
    95     return 0;
    96 }
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  • 原文地址:https://www.cnblogs.com/bombe1013/p/4296914.html
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