Circle And Chords
easy
1. You are given a number N. 2. There are 2*N points on a circle. You have to draw N non-intersecting chords on a circle. 3. You have to find the number of ways in which these chords can be drawn.
Constraints
1 <= N <= 1000 1 <= arr[i] <= 100
Format
Input
A number N
Output
Check the sample output and question video.
Example
Sample Input
3
Sample Output
5
Question Video