Print All Paths from Top left to bottom right in Two Dimensional Array

Objective: Print all the paths from left top corner to right bottom corner in two dimensional array.

Input: Two Dimensional array

Output: Print all the paths.

Note: At the End of the article you will know what needs to be included if you want to print the diagonal paths as well.

Example:

Print All Paths - Example

Approach:

As we need to explore all the paths from top left corner to bottom right corner, we will either travel down OR travel right. so every time either we increase the row or column.

  • Recursion is the key here.
  • Take the rows count and column counts say rowCount and colCount respectively
  • Take currentRow =0 and currentColumn =0 and path =””
  • Call printAll(currentRow, currentcolumn,path)
  • Add array[0][0] to the path.
  • Call recursively printAll(currentRow+1, currentcolumn,path)
  • Call recursively printAll(currentRow, currentcolumn+1,path)
  • Base Case 1: when currentRow = rowCount-1(because array index starts with 0) , print the rest of the columns, return
  • Base Case 2: when currentcolumn = colCount-1(because array index starts with 0) , print the rest of the rows, return

Like always you need to trust Recursion to get you the correct result. 🙂

Recursion Tree -Print All Paths

click on the image to make it bigger

Complete Code:


Output:

-1-4-7-8-9
-1-4-5-8-9
-1-4-5-6-9
-1-2-5-8-9
-1-2-5-6-9
-1-2-3-6-9

Note: printAll(currentRow+1,currentColumn+1,path); Add this line when you want to print diagonal paths as well (see code)

__________________________________________________
Top Companies Interview Questions..-

Google Microsoft Amazon Facebook more..

If you find anything incorrect or you feel that there is any better approach to solve the above problem, please write comment.
__________________________________________________

You may also like...

  • deen john

    this code is not producing the correct output. please check. i am getting :-1-4-5-6

    -1-2-5-6

    -1-2-3-6

    -1-2-6

    -1-5-6

    • tutorialhorizon

      Is it nxn matrix u r providing ?

      • deen john

        the code is correct but it’s for ” Print All Paths from Top left to bottom right in Two Dimensional Array including Diagonal” not “Print All Paths from Top left to bottom right in Two Dimensional Array”. you haven’t comment the line- printAll(currentRow + 1, currentColumn + 1, path);

      • deen john

        I like your website for the detailed easy answers and it’s a big help. I have a small request too- Could you please add tutorials for Graph based algorithms/Datastructures problems .

  • deen john

    there is some problem with your code. it’s not producing correct result

  • Xenial

    Thank you!! You are the best!!! Keep up the good work. Love this website. 🙂

%d bloggers like this: