数据结构：C语言走迷宫---栈/队列实现

Gabriel

发布于 2022-11-15 05:55:46

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代码可运行

文章被收录于专栏：C/C++C/C++

运行总次数：0

代码可运行

走矩阵迷宫，0代表可以走，1代表障碍物

栈实现：

#include <stdio.h>

#define MAX_ROW 5
#define MAX_COL 5

struct point
{
    int row;
    int col;
};

struct point stack[512];
int top = 0;

void push(struct point p)
{
	stack[top++] = p;
}

struct point pop(void)
{
	return stack[--top];
}

int is_empty(void)
{
	return top == 0;
}

int maze[MAX_ROW][MAX_COL] = {
	0, 1, 0, 0, 0,
	0, 1, 0, 1, 0,
	0, 0, 0, 1, 0,
	0, 1, 1, 1, 0,
	0, 0, 0, 1, 0,
};

void print_maze(void)
{
	int i, j;
	for (i = 0; i < MAX_ROW; i++)
	{
		for (j = 0; j < MAX_COL; j++)
		{
		    printf("%d ", maze[i][j]);
		}
		putchar('\n');
	}
	printf("*********\n");
}

struct point predecessor[MAX_ROW][MAX_COL] =
{
	{{-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}},
	{{-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}},
	{{-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}},
	{{-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}},
	{{-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}, {-1,-1}},
};

void visit(int row, int col, struct point pre)
{
	struct point visit_point = { row, col };
	maze[row][col] = 2;
	predecessor[row][col] = pre;
	push(visit_point);
}

int main(void)
{
	struct point p = { 0, 0 };

	maze[p.row][p.col] = 2;
	push(p);

	while (!is_empty())
	{
		p = pop();
		if (p.row == MAX_ROW - 1  /* goal */
		    && p.col == MAX_COL - 1)
			break;
		if (p.col+1 < MAX_COL     /* right */
		    && maze[p.row][p.col+1] == 0)
			visit(p.row, p.col+1, p);
		if (p.row+1 < MAX_ROW     /* down */
		    && maze[p.row+1][p.col] == 0)
			visit(p.row+1, p.col, p);
		if (p.col-1 >= 0          /* left */
		    && maze[p.row][p.col-1] == 0)
			visit(p.row, p.col-1, p);
		if (p.row-1 >= 0          /* up */
		    && maze[p.row-1][p.col] == 0)
			visit(p.row-1, p.col, p);
		print_maze();
	}

	if (p.row == MAX_ROW - 1 && p.col == MAX_COL - 1)
	{
		printf("(%d, %d)\n", p.row, p.col);
		while (predecessor[p.row][p.col].row != -1)
	    {
			p = predecessor[p.row][p.col];
			printf("(%d, %d)\n", p.row, p.col);
		}
	} else
		printf("No path!\n");

	return 0;
}

队列实现：

#include <stdio.h>

#define MAX_ROW 5
#define MAX_COL 5

struct point { int row, col, predecessor; } queue[512];
int head = 0, tail = 0;

void enqueue(struct point p)
{
	queue[tail++] = p;
}

struct point dequeue(void)
{
	return queue[head++];
}

int is_empty(void)
{
	return head == tail;
}

int maze[MAX_ROW][MAX_COL] = {
	0, 1, 0, 0, 0,
	0, 1, 0, 1, 0,
	0, 0, 0, 1, 0,
	0, 1, 1, 1, 0,
	0, 0, 0, 1, 0,
};

void print_maze(void)
{
	int i, j;
	for (i = 0; i < MAX_ROW; i++)
	{
		for (j = 0; j < MAX_COL; j++)
		{
			printf("%d ", maze[i][j]);
		}
		putchar('\n');
	}
	printf("*********\n");
}

void visit(int row, int col)
{
	struct point visit_point = { row, col, head-1 };
	maze[row][col] = 2;
	enqueue(visit_point);
}

int main(void)
{
	struct point p = { 0, 0, -1 };

	maze[p.row][p.col] = 2;
	enqueue(p);

	while (!is_empty())
 	{
		p = dequeue();
		if (p.row == MAX_ROW - 1  /* goal */
		    && p.col == MAX_COL - 1)
			break;
		if (p.col+1 < MAX_COL     /* right */
		    && maze[p.row][p.col+1] == 0)
			visit(p.row, p.col+1);
		if (p.row+1 < MAX_ROW     /* down */
		    && maze[p.row+1][p.col] == 0)
			visit(p.row+1, p.col);
		if (p.col-1 >= 0          /* left */
		    && maze[p.row][p.col-1] == 0)
			visit(p.row, p.col-1);
		if (p.row-1 >= 0          /* up */
		    && maze[p.row-1][p.col] == 0)
			visit(p.row-1, p.col);
		print_maze();
	}

	if (p.row == MAX_ROW - 1 && p.col == MAX_COL - 1)
    	{
		printf("(%d, %d)\n", p.row, p.col);
		while (p.predecessor != -1)
 		 {
			p = queue[p.predecessor];
			printf("(%d, %d)\n", p.row, p.col);
		}
	} else
		printf("No path!\n");

	return 0;
}