Unique Paths

There is a robot on an m x n grid. The robot is initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the bottom-right corner (i.e., grid[m - 1][n - 1]). The robot can only move either down or right at any point in time.

Given the two integers m and n, return the number of possible unique paths that the robot can take to reach the bottom-right corner.

The test cases are generated so that the answer will be less than or equal to 2 * 10^9

Input Format -

First Parameter: number m

Second Parameter: number n

Output Format -

Return the number.

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 -> Down -> Down
2. Down -> Down -> Right
3. Down -> Right -> Down

Example 2

Input: m = 3, n = 7
Output: 28

Constraints

• 1 <= m, n <= 100
• Expected Time Complexity: O(m * n)
• Expected Space Complexity: O(n)