迷宫问题

迷宫问题的解决方法主要是利用栈，对于入口处开始当遍历数为0时，就将这个数压入栈底，并将这个数改为2，当一条通路已经找到最远处，却没有到最底，这个时候就要回溯，将有些数弹出栈。

#define N 10

struct pos

{

int _row;

int _col;

};

void GetMaze(int *a, int n)

{

FILE *fout = fopen("Maze.txt", "r");

for (int i = 0; i < N;i++)

for (int j = 0; j < N;)

{

char ch = fgetc(fout);

if (ch == '0' || ch == '1')

{

a[i*N + j] = ch - '0';

j++;

}

else

{

continue;

}

}

fclose(fout);

}

void print(int *a, int n)

{

for (int i = 0; i < N; i++)

{

for (int j = 0; j < N; j++)

{

cout << a[i*N + j] << " ";

}

cout << "\n";

}

}

bool check(int *a,pos next)

{

if (next._row >= 0 && next._row < N&&next._col >= 0 && next._col < N&&a[next._row*N + next._col] == 0)

return true;

return false;

}

bool MazePath(int *a, int n, pos &entry, stack<pos>&path)

{

pos man = entry;

path.push(man);

while (!path.empty())

{

if (man._row == N - 1)

{

return true;

}

a[man._row*N + man._col] = 2;

pos next = man;

next._row--;

if (check((int*)a, next))

{

man = next;

path.push(man);

continue;

}

next = man;

next._row++;

if (check((int*)a, next))

{

man = next;

path.push(man);

continue;

}

next = man;

next._col--;

if (check((int*)a, next))

{

man = next;

path.push(man);

continue;

}

next = man;

next._col++;

if (check((int*)a, next))

{

man = next;

path.push(man);

continue;

}

man = path.top();

path.pop();

}

}

void Test()

{

int a[N][N] = {};

GetMaze((int *)a, N);

print((int *)a, N);

stack<pos>p;

pos entry = { 2, 0 };

cout<<MazePath((int *)a, N, entry, p);

}

int main()

{

Test();

getchar();

return 0;

}