#include <stdio.h>
#include <string.h>
#include "maze.h"
#include <assert.h>

int issafe(char* maze, int x, int y, int size) {
    if ((x >= 0 && x < size) && (y >= 0 && y < size) && (maze[x * size + y] == ' ')){
        return 1;
    }
    return 0;
}

int backtracking(char* maze, int x, int y, int size){
    if(x == size - 1 && y == size - 1 && maze[x * size + y] == ' '){
        maze[x * size + y] = '*';
        return 1;
    }

    if(issafe(maze, x, y, size) == 1) {
        maze[x * size + y] = '*';

        if (backtracking(maze, x, y + 1, size) == 1) {
            return 1;
        }
        if (backtracking(maze, x + 1, y, size) == 1) {
            return 1;
        }
        if (backtracking(maze, x - 1, y, size) == 1) {
            return 1;
        }
        if (backtracking(maze, x, y - 1, size) == 1) {
            return 1;
        }
        maze[x * size + y] = ' ';
    }
    return 0;
}

int solve_maze(char* maze, int size) {
    return backtracking(maze, 0, 0, size);
}