poj3984迷宫问题(DFS广搜)

迷宫问题

Time Limit: 1000MS
Memory Limit: 65536K

Description

定义一个二维数组:


int maze[5][5] = {
0, 1, 0, 0, 0,
0, 1, 0, 1, 0,
0, 0, 0, 0, 0,
0, 1, 1, 1, 0,
0, 0, 0, 1, 0,
};

它表示一个迷宫,其中的1表示墙壁,0表示可以走的路,只能横着走或竖着走,不能斜着走,要求编程序找出从左上角到右下角的最短路线。

Input

一个5 × 5的二维数组,表示一个迷宫。数据保证有唯一解。

Output

左上角到右下角的最短路径,格式如样例所示。

Sample Input

0 1 0 0 0
0 1 0 1 0
0 0 0 0 0
0 1 1 1 0
0 0 0 1 0

Sample Output

(0, 0)
(1, 0)
(2, 0)
(2, 1)
(2, 2)
(2, 3)
(2, 4)
(3, 4)
(4, 4)
 
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <queue>
using namespace std;
bool ism[5][5];
int a[5][5];
int dx[4]={0, 1, 0, -1};
int dy[4] = { 1, 0, -1, 0 };
struct Node{
    int x;
    int y;
    int s;
    short l[30];
};
bool judge(int x, int y){
    if (x < 0 || x >= 5 || y < 0 || y >= 5)
        return true;
    if (ism[x][y])
        return true;
    if (a[x][y] == 1)
        return true;
    return false;
}
Node bfs(){
    queue<Node> q;
    Node cur, next;
    cur.x = 0;
    cur.y = 0;
    cur.s = 0;
    ism[cur.x][cur.y] = true;
    q.push(cur);
    while (!q.empty()){
        cur = q.front();
        q.pop();
        if (cur.x == 4 && cur.y == 4)
            return cur;
        int i, nx, ny;
        for (i = 0; i < 4; i++){
            nx = cur.x + dx[i];
            ny = cur.y + dy[i];
            if (judge(nx, ny))
                continue;
            next = cur;
            next.x = nx;
            next.y = ny;
            next.s = cur.s+1;
            next.l[cur.s] = i;
            q.push(next);
        }
    }
    return cur;
}
int main(){
    int i, j;
    for (i = 0; i < 5; i++){
        for (j = 0; j < 5; j++){
            scanf("%d", &a[i][j]);
        }
    }
    memset(ism, 0, sizeof(ism));
    Node ans = bfs();
    int x, y;
    x = 0, y = 0;
    for (i = 0; i<= ans.s; i++){
        printf("(%d,%d)
", x, y);
        x += dx[ans.l[i]];
        y += dy[ans.l[i]];
    }
    return 0;
}
天晴了,起飞吧
原文地址:https://www.cnblogs.com/jianqiao123/p/10792186.html