迷宮

#include<iostream>
#include<stack>
using namespace std;
#pragma warning(disable:4996)

const int N = 5;

//從文本中讀取迷宮存入數組
template<class T>
void InitMaze(T** arr)
{
    FILE* f = fopen("maze.txt", "r");
    if (f == NULL)
    {
        cout << "open maze fail" << endl;
        return;
    }
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N; j++)
        {
            int ch = fgetc(f);
            if (ch == ' ' || ch == '\n')
            {
                j -= 1;
            }
            else
            {
                arr[i][j] = ch - '0';
                continue;
            }
        }
    }
    fclose(f);
}


 struct Step //當前位置信息
{
    int _row;  //行
    int _col;  //列
};

template<class T>
bool Maze(T** arr, int EntranceRow, int EntranceCol)
{
    Step step;
    stack<Step> s;
    step._row = EntranceRow;
    step._col = EntranceCol;
    if (s.empty())
    {
        arr[EntranceRow][EntranceCol] = 2; //將走過的位置賦值爲2
        s.push(step);           //將入口信息插入棧中
    }
    while (step._row < N - 1) 
    {
        //向上走
        step._row -= 1;
        if (step._row >= 0 && step._row < N && step._col >= 0 && step._col < N && !s.empty())
        {
            if (arr[step._row][step._col] == 0)
            {
                arr[step._row][step._col] = 2;
                s.push(step);
                continue;
            }
        }
        //向右走
        step._row += 1; //恢復行數
        step._col += 1;
        if (step._row >= 0 && step._row < N && step._col >= 0 && step._col < N && !s.empty())
        {
            if (arr[step._row][step._col] == 0)
            {
                arr[step._row][step._col] = 2;
                s.push(step);
                continue;
            }
        }

        //向下走
        step._col -= 1; //恢復列數
        step._row += 1;
        if (step._row >= 0 && step._row < N && step._col >= 0 && step._col < N && !s.empty())
        {
            if (arr[step._row][step._col] == 0)
            {
                arr[step._row][step._col] = 2;
                s.push(step);
                continue;
            }
        }
        //向左走
        step._row -= 1; //恢復行數
        step._col -= 1;
        if (step._row >= 0 && step._row < N && step._col >= 0 && step._col < N && !s.empty())
        {
            if (arr[step._row][step._col] == 0)
            {
                arr[step._row][step._col] = 2;
                s.push(step);
                continue;
            }
        }

        if (!s.empty())
        {
            step = s.top();
            arr[step._row][step._col] = 3; //講行不通的位置賦值爲3
            s.pop();
            step = s.top(); //取出棧頂元素
            continue;
        }
        else
        {
            return false;
        }
    }
    return true;
}

template<class T>
void Print(T** arr)
{
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N; j++)
        {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }
    cout << endl;
}


int main()
{
    //動態開闢二維數組
    int** arr = new int*[N];
    for (int i = 0; i < N; i++)
    {
        arr[i] = new int[N];
    }
    InitMaze<int>(arr);
    Maze(arr,1,0);
    Print<int>(arr);
    for (int i = 0; i < N; i++) //釋放二維數組
    {
        delete[] arr[i];
        arr[i] = NULL;
    }
    delete[] arr;
    arr = NULL;
    getchar();
    return 0;
}