迷宮問題

迷宮問題

原創

2020-02-22 17:43

難得在編程論壇看到一個優秀的代碼，學習一下，

作者：鬼鬼千年
#include<stdio.h>
int maze[10][10] = {
        {1,1,1,1,1,1,1,1,1,1},
        {1,0,0,1,0,0,0,1,0,1},
        {1,0,0,1,0,0,0,1,0,1},
        {1,0,0,0,0,1,1,0,0,1},
        {1,0,1,1,1,0,0,0,0,1},
        {1,0,0,0,1,0,0,0,0,1},
        {1,0,1,0,0,0,1,0,0,1},
        {1,0,1,1,1,0,1,1,0,1},
        {1,1,1,0,0,0,0,0,0,1},
        {1,1,1,1,1,1,1,1,1,1}};/*初始化迷宮*/
int mark[10][10] = {0};/*初始化標誌位,0代表沒走過,1代表走過*/

/*方向*/
typedef struct{
    short int vert;
    short int horiz;
}offsets;

offsets move[4] = {{0,1},{1,0},{0,-1},{-1,0}};/*北,東,南,西*/

/*迷宮類型*/
typedef struct element{
    short int row;
    short int col;
    short int dir;
}element;

element stack[100];

void path(void);
  element del(int* top);
void add(int* top,element item);

element del(int* top)/*出棧,top指向棧頂元素*/
{
    if(*top == -1)
    {
        printf("stack is empty!\n");
    }
    return stack[(*top)--];
}

void add(int* top,element item)/*入棧*/
{
    if(*top >= 100)
    {
        printf("stack is full!\n");
        return;
    }
    stack[++*top] = item;
}

void path(void)/*迷宮函數*/
{
    element position;
    int i,row,col,next_row,next_col,dir,top;
    int found = 0;
    mark[1][8] = 1,top = 0;/*初始化標誌數組元素以及棧*/
    stack[0].row = 1,stack[0].col = 8,stack[0].dir = 0;
    while(top > -1 && !found)
    {
          position= del(&top);  /*將棧頂元素取出,*/
        row = position.row;            /*利用中間變量row,col,dir等候判斷*/
        col = position.col;
        dir = position.dir;
        while(dir < 4 && !found)
        {
            next_row = row + move[dir].vert;
            next_col = col + move[dir].horiz;
            if(row == 7 && col == 1)
                found = 1;
            else if(!maze[next_row][next_col] && !mark[next_row][next_col])/*判斷下一步可走並且沒走過,則入棧*/
                    {
                        mark[next_row][next_col] = 1;
                        position.row = row;
                        position.col = col;
                        position.dir = ++dir;
                        add(&top,position);/*合理則入棧*/
                        row = next_row;/*繼續向下走*/
                        col = next_col;dir = 0;
                    }
                    else
                        dir++;/*dir<4時,改變方向*/

        }
        if(found)/*判斷是否有出口*/
        {
            printf("the path is:\n");
            printf("row col\n");
            for(i = 0;i <= top;++i)
                printf("(%2d,%5d)",stack[i].row,stack[i].col);
                printf("(%2d,%5d)\n",7,1);


        }


    }
    if(found==0)
        printf("沒有路徑\n");
}

int main(void)
{
    path();

return 0;
}