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The mouse in the maze problem is one of the well-known backtracking problems. Here we will see that the problem remains almost unchanged. Suppose an NxN maze M is given. The starting point is the upper left corner M[0, 0], and the end point is the lower right corner M[N – 1, N – 1]. A mouse is placed at the starting point. Our goal is to find a path from the starting point to the end point that allows the mouse to reach its destination. Here mice can jump (variant). Now there are some restrictions
begin if destination is reached, then print the solution matrix else 1. Place the current cell inside the solution matrix as 1 2. Move forward or jump (check max jump value) and recursively check if move leads to solution or not. 3. If the move taken from the step 2 is not correct, then move down, and check it leads to the solution or not 4. If none of the solutions in step 2 and 3 are correct, then make the current cell 0. end if end
#include <iostream> #define N 4 using namespace std; void dispSolution(int sol[N][N]) { for (int i = 0; i < N; i++) { for (int j = 0; j < N; j++) cout << sol[i][j] << " "; cout << endl; } } bool isSafe(int maze[N][N], int x, int y) { //check whether x,y is valid or not // when (x, y) is outside of the maze, then return false if (x >= 0 && x < N && y >= 0 && y < N && maze[x][y] != 0) return true; return false; } bool ratMazeSolve(int maze[N][N], int x, int y, int sol[N][N]) { if (x == N - 1 && y == N - 1) { //if destination is found, return true sol[x][y] = 1; return true; } if (isSafe(maze, x, y)) { sol[x][y] = 1; //mark 1 into solution matrix for (int i = 1; i <= maze[x][y] && i < N; i++) { if (ratMazeSolve(maze, x + i, y, sol)) //move right return true; if (ratMazeSolve(maze, x, y + i, sol)) //move down return true; } sol[x][y] = 0; //if the solution is not valid, then make it 0 return false; } return false; } bool solveMaze(int maze[N][N]) { int sol[N][N] = { { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } }; if (!ratMazeSolve(maze, 0, 0, sol)) { cout << "Solution doesn't exist"; return false; } dispSolution(sol); return true; } main() { int maze[N][N] = { { 2, 1, 0, 0 }, { 3, 0, 0, 1 }, { 0, 1, 0, 1 }, { 0, 0, 0, 1 } }; solveMaze(maze); }
1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1
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