为什么这个最短路径无法显示，怎么修改

Question

输入o后不显示最短径，显示地图中也无8

stack<point> sta;
int Endx, Endy;
int Min = 1000;
int v[100][100] = { 0 };//访问数组0未访问7访问
int v1[100][100] = { 0 };

void DFS(int x, int y, int step)//x，y表示当前坐标点
{
    if (x == Endx - 1 && y == Endy - 1)//到达终点
    {

        if (step < Min)
        {
            Min = step;
            for (int i = 0; i < Min; i++)
            {
                //for (int j = 0; j < Min; j++)
                {
                    map[key][sta.top().i][sta.top().j] = 8;
                }
                sta.pop();
            }
        }
        for (int i = 0; i < sta.size(); i++)
            sta.pop();
        return;
    }
    else//x，y不是终点:则开始试探
    {
        //顺时针右下左上试探
        if (map[key][x][y + 1] == 1 && v[x][y + 1] == 0)//向右
        {
            v[x][y + 1] = 7;//访问了
            point temp;
            temp.i = x;
            temp.j = y + 1;
            sta.push(temp);
            DFS(x, y + 1, step + 1);
            v[x][y + 1] = 0;//回溯时设置为0未访问
            //sta.pop();
        }
        if (map[key][x + 1][y] == 1 && v[x + 1][y] == 0)//向下
        {
            v[x + 1][y] = 7;//访问了
            point temp;
            temp.i = x + 1;
            temp.j = y;
            sta.push(temp);
            DFS(x + 1, y, step + 1);
            v[x + 1][y] = 0;//回溯时设置为0未访问
            //sta.pop();
        }
        if (map[key][x][y - 1] == 1 && v[x][y - 1] == 0)//向左
        {
            v[x][y - 1] = 7;//访问了
            point temp;
            temp.i = x;
            temp.j = y - 1;
            sta.push(temp);
            DFS(x, y - 1, step + 1);
            v[x][y - 1] = 0;//回溯时设置为0未访问
            //sta.pop();
        }
        if (map[key][x - 1][y] == 1 && v[x - 1][y] == 0)//向上
        {
            v[x - 1][y] = 7;//访问了
            point temp;
            temp.i = x - 1;
            temp.j = y;
            sta.push(temp);
            DFS(x - 1, y, step + 1);
            v[x - 1][y] = 0;//回溯时设置为0未访问
            //sta.pop();
        }
        return;
    }
}

void FindShortPath()
{
    const int m = 21, n = 21;

    for (int i = 0; i < bound; i++)
    {
        for (int j = 0; j < bound; j++)
        {
            copyMap[i][j] = map[key][i][j];//克隆数组
        }
    }
    for (int i = 0; i < bound; i++)
    {
        for (int j = 0; j < bound; j++)
        {
            if (map[key][i][j] == 9)
            {
                player.i = i;
                player.j = j;
                map[key][i][j] = 1;//将初始位置覆盖
            }
            if (map[key][i][j] == 4)
            {//放置粮仓
                granarys.i = i;
                granarys.j = j;
            }
        }
    }

    int Beginx = player.i;
    int Beginy = player.j;
    int Endx = granarys.i;
    int Endy = granarys.j;

    memset(v, 0, sizeof(v));
    memset(v1, 0, sizeof(v1));
    Min = INT_MAX; // 重置最短路径

    v[Beginx][Beginy] = 8;
    v1[Beginx][Beginy] = 8;

    DFS(Beginx, Beginy, 0);


    for (int i = 0; i < m; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cout << map[key][i][j] << ' ';
        }
        cout << endl;
    }

    return;
}
void Show()
{
    int i, j;
    cleardevice();
    for (i = 0; i < bound; i++)
    {
        for (j = 0; j < bound; j++)
        {
            if (map[key][i][j] == 0)//绘制墙体1
                putimagePng(j * imSize, i * imSize, &wall);
            if (map[key][i][j] == 3)//绘制墙体2
                putimagePng(j * imSize, i * imSize, &wall_2);
            if (map[key][i][j] == 4)//绘制粮仓
                putimagePng(j * imSize, i * imSize, &granary_Png);
            if (map[key][i][j] == 7)//显示全部路径
            {
                setfillcolor(GREEN);
                fillrectangle(j * imSize, i * imSize, (j + 1) * imSize, (i + 1) * imSize);
            }
            if (map[key][i][j] == 8)//显示最短路径
            {
                setfillcolor(RED);
                fillrectangle(j * imSize, i * imSize, (j + 1) * imSize, (i + 1) * imSize);

            }
            if (map[key][i][j] == 1)
                //通道
                if (map[key][i][j] == 9)
                {
                    if (direction == 4)
                    {
                        putimage(j * imSize, i * imSize, &mouse_down);
                    }
                    else if (direction == 3)
                    {
                        putimage(j * imSize, i * imSize, &mouse_right);
                    }
                    else if (direction == 2)
                    {
                        putimage(j * imSize, i * imSize, &mouse_up);
                    }
                    else if (direction == 1)
                    {
                        putimage(j * imSize, i * imSize, &mouse_left);
                    }
                }
            if (player.i == granarys.i && player.j == granarys.j)//到达终点
            {
                Texttip();
                key++;
                closegraph();
                if (key != 3)
                    Start();
                else
                {
                    Texttip2();
                    closegraph();
                    return;
                }
            }
            if (item == 3)//绘制编辑网格
            {
                setlinecolor(GREEN);
                rectangle(j * imSize, i * imSize, (j + 1) * imSize, (i + 1) * imSize);
            }
        }
    }
void Input()
{
    while (!_kbhit()) //检查是否有输入，没输入时则更新时间
    {
        BeginBatchDraw();
        if (!UpdateAndShowTime()) {        //当该函数返回false，即超时
            Texttip4();
            key = 3;
            return;
        }
        FlushBatchDraw();
    }
    char input = _getch();
    if (input == 'a' || input == 's' || input == 'd' || input == 'w' || input == 'c' || input == 'i' || input == 'o')//按c编辑迷宫,i显示全部路径
    {//有效按键
        int goal_i = player.i;
        int goal_j = player.j;
        int goalNext_i = goal_i;
        int goalNext_j = goal_j;

        if (input == 'c')
        {
            item = 3;
            Change();
        }

        if (input == 'i')
        {
            item = 5;
            if (item == 5)
                FindAllPath();
        }
        if (input == 'o')
        {
            item = 6;
            if (item == 6)
                FindShortPath();
        }
        if (input == 'a')
        {
            goal_j = player.j - 1;
            goalNext_j = player.j - 1;
            direction = 1;
        }
        else if (input == 'd')
        {
            goal_j = player.j + 1;
            goalNext_j = player.j + 1;
            direction = 3;
        }
        else if (input == 'w')
        {
            goal_i = player.i - 1;
            goalNext_i = player.i - 1;
            direction = 2;
        }
        else if (input == 's')
        {
            goal_i = player.i + 1;
            goalNext_i = player.i + 1;
            direction = 4;
        }

        if (map[key][goal_i][goal_j] == 1 || map[key][goal_i][goal_j] == 7 || map[key][goal_i][goal_j] == 8
            || map[key][goalNext_i][goalNext_j] == 1 || map[key][goal_i][goal_j] == 7 || map[key][goal_i][goal_j] == 8)
        {
            player.i = goal_i;
            player.j = goal_j;
        }
        if (map[key][goal_i][goal_j] == 4)
        {
            player.i = goal_i;
            player.j = goal_j;
            player.j = goal_j;
        }
    }
    else//其他情况不予考虑
        return;
}

Answer 1

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解答

你的问题是关于C++中使用深度优先搜索算法实现最短路径计算，但是无法显示结果。下面是可能的解决方案：

1. 检查算法是否正确：请检查你的深度优先搜索算法是否正确，是否正确地更新了最短路径的值。
2. 检查访问数组的使用：在你的代码中，你使用了两个访问数组v和v1，请检查它们是否正确地使用了。
3. 检查输出结果：请检查你的输出结果是否正确，是否正确地显示了最短路径。

以下是一个简单的示例代码，使用深度优先搜索算法计算最短路径：

void DFS(int x, int y, int dist) {
    if (x == Endx && y == Endy) {
        if (dist < Min) {
            Min = dist;
            // 输出最短路径
        }
    } else {
        for (int i = 0; i < 4; i++) {
            int nx = x + dx[i];
            int ny = y + dy[i];
            if (nx >= 0 && nx < 100 && ny >= 0 && ny < 100 && v[nx][ny] == 0) {
                v[nx][ny] = 1;
                DFS(nx, ny, dist + 1);
                v[nx][ny] = 0;
            }
        }
    }
}

在这个示例代码中，我们使用深度优先搜索算法遍历图形，更新最短路径的值，并输出最短路径。

如果你仍然无法解决问题，请提供更多的代码和详细的错误信息，我将尽力帮助你解决问题。