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python/C++课程/待整理知识/啊哈算法/dfs解求小哈.cpp
HuangHai 1f397eca87 'commit'
2025-08-30 18:35:01 +08:00

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#include<stdio.h>
int n,m,p,q,min=99999999;
int a[51][51],book[51][51];
void dfs(int x,int y,int step)
{
int next[4][2]={
{0,1},//向右走
{1,0},//向下走
{0,-1},//向左走
{-1,0},//向上走
};
int tx,ty,k;
if(x==p && y==q) //判断是否到达小哈的位置
{
if(step<min)
min=step; //更新最小值
return;
}
/*枚举四种走法*/
for(k=0;k<=3;k++)
{
/*计算下一个点的坐标*/
tx=x+next[k][0];
ty=y+next[k][1];
if(tx<1 || tx>n || ty<1 || ty>m) //判断是否越界
continue;
/*判断该点是否为障碍物或者已经在路径中*/
if(a[tx][ty]==0 && book[tx][ty]==0)
{
book[tx][ty]=1; //标记这个点已经走过
dfs(tx,ty,step+1); //开始尝试下一个点
book[tx][ty]=0; //尝试结束,取消这个点的标记
}
}
return;
}
int main()
{
int i,j,startx,starty;
scanf("%d %d",&n,&m); //读入n和m,n为行,m为列
/*读入迷宫*/
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
scanf("%d",&a[i][j]);
scanf("%d %d %d %d",&startx,&starty,&p,&q); //读入起点和终点坐标
/*从起点开始搜索*/
book[startx][starty]=1; //标记起点已经在路径中,防止后面重复走
dfs(startx,starty,0); //第一个参数是起点的x坐标,以此类推是起点的y坐标,初始步数为0
printf("%d",min); //输出最短步数
return 0;
}