Solving Unique Paths in Javascript. Please try yourself first to solve the problem and submit your implementation to LeetCode before looking into solution.

Problem Description

A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked 'Finish' in the diagram below).

How many possible unique paths are there?

Example 1:
Input: m = 3, n = 2
Output: 3

Explanation:

From the top-left corner, there are a total of 3 ways to reach the bottom-right corner:

  1. Right -> Right -> Down
  2. Right -> Down -> Right
  3. Down -> Right -> Right
Example 2:
Input: m = 7, n = 3
Output: 28

See the full details of the problem Unique Paths at LeetCode

Originally posted at: @github.com/ignacio-chiazzo/Algorithms-Leetcode-Javascript