Maze with N Doors and 1 Key Problem Statement

You are given an N x N maze where some cells have doors, and you have a key that can be used only once to open a door. Determine if there exists a path from the top-left cell to the bottom-right cell of the maze, allowing only downward and rightward movements.

Input:

The first line of the input contains an integer 'T' denoting the number of test cases. 
Then 'T' test cases follow.
Each test case begins with an integer 'N', the side length of the square binary maze.
Following are 'N' lines for each test case, with each line containing 'N' space-separated integers (either 1 or 0) that indicate whether each cell has a door or not.

Output:

For each test case, print "YES" if the bottom-right corner is reachable using the key, otherwise print "NO".

Example:

Input:
2
3
0 1 0
1 1 0
0 0 0
2
0 1
1 0

Output:
YES
YES

Constraints:

  • 1 <= T <= 100
  • 1 <= N <= 100
  • MAZE[i][j] = {0, 1}

Note:

  • You have only one key, and it is exhausted after one use.
  • A cell with a value of 1 indicates a door, which you must open using the key to pass.
  • A cell with a value of 0 indicates a free path and can be traversed without using the key.
  • The top-left and bottom-right cells may also have doors.
  • Only downward (from cell (i, j) to (i, j+1)) and rightward (from cell (i, j) to (i+1, j)) movements are allowed.
AnswerBot
4mo

Determine if there exists a path from the top-left cell to the bottom-right cell of a maze with N doors and 1 key.

  • Use depth-first search (DFS) or breadth-first search (BFS) to explore possible paths t...read more

Help your peers!
Select
Add answer anonymously...

Top Software Developer Interview Questions Asked at Amazon

Q. Could you describe the process for designing a data structure that allows for al...read more
Q. What is Java?
Q. Given two strings s and t, return true if they are equal when both are typed int...read more
Software Developer Interview Questions
Stay ahead in your career. Get AmbitionBox app
play-icon
play-icon
qr-code
Trusted by over 1.5 Crore job seekers to find their right fit company
80 L+

Reviews

10L+

Interviews

4 Cr+

Salaries

1.5 Cr+

Users

Contribute to help millions

Made with ❤️ in India. Trademarks belong to their respective owners. All rights reserved © 2025 Info Edge (India) Ltd.

Follow Us
  • Youtube
  • Instagram
  • LinkedIn
  • Facebook
  • Twitter
Profile Image
Hello, Guest
AmbitionBox Employee Choice Awards 2025
Winners announced!
awards-icon
Contribute to help millions!
Write a review
Write a review
Share interview
Share interview
Contribute salary
Contribute salary
Add office photos
Add office photos
Add office benefits
Add office benefits