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Number of Diagonals
School Accuracy: 44.21% Submissions: 242 Points: 0

Given a number N, the task is to find the number of diagonals in N sided convex polygon.

Example 1:

Input: N = 5
Output: 5

Example 2:

Input: N = 6
Output: 9


Your Task:  
You don't need to read input or print anything. Your task is to complete the function diagonals() which takes N as input and returns the number of possible diagonals.

Expected Time Complexity: O(1)
Expected Auxiliary Space: O(1)


Constraints:
3 ≤ N ≤ 109

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Number of Diagonals

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