uva784-迷宫探索

此题为白书数据结构基础图的训练参考

 

题目链接 http://acm.hust.edu.cn/vjudge/problem/18558

 

解题思路

图的BFS。代码白书里也写了。

 

从开始点开始，然后尽情BFS吧。。。

 

代码

#include<string.h>
#include<stdio.h>
//#define LOCAL
const int maxLen = 100;
typedef struct point {
    int x, y;
}Point;
char maze[maxLen][maxLen];
//int visit[maxLen][maxLen];
int wei[100], len = 0;
int dx[] = {1,-1,0,0};
int dy[] = {0,0,-1,1};
Point q[3000];
void bfs(Point start)
{
    int front = -1, rear = -1;
    q[++rear] = start;
    while(front != rear) {
        Point u = q[++front];
        for(int d=0; d<4; d++) {
            int ux = u.x+dx[d], uy = u.y+dy[d];
            if(ux>=0 && ux<len && uy>=0 && uy<wei[ux] && maze[ux][uy]==' ') {
                Point temp;
                temp.x = ux; temp.y = uy;
                q[++rear] = temp;
                //visit[ux][uy] = 1;
                maze[ux][uy] = '#';
            }
        }
    }
    maze[start.x][start.y] = '#'; 
}
int main()
{
    #ifdef LOCAL
        freopen("data.txt", "r", stdin);
        freopen("ans.txt", "w", stdout);
    #endif
    int n;
    scanf("%d", &n);
    getchar(); 
    while(n--) {
        char s[maxLen];
        Point start;
        //memset(visit, 0, sizeof(visit));
        len = 0;
        gets(s);
        while(strchr(s, '_') == NULL) {
            for(int j=0; j<strlen(s); j++) {
                if(s[j] == '*') { start.x = len; start.y = j; }
                maze[len][j] = s[j];
            }
            wei[len] = strlen(s);
            len++; gets(s);
        }
        bfs(start);
        for(int i=0; i<len; i++) {
            for(int j=0; j<wei[i]; j++) printf("%c", maze[i][j]);
            printf("\n");
        }
        puts(s);
    }
    return 0;
}