Rotate by 90 degree
Basic Accuracy: 52.86% Submissions: 20516 Points: 1

Given a square matrix of size N x N. The task is to rotate it by 90 degrees in anti-clockwise direction without using any extra space. 

Example 1:

Input:
N = 3 
matrix[][] = {{1, 2, 3},
              {4, 5, 6}
              {7, 8, 9}}
Output: 
Rotated Matrix:
3 6 9
2 5 8
1 4 7

Example 2:

Input:
N = 2
matrix[][] = {{1, 2},
              {3, 4}}
Output: 
Rotated Matrix:
2 4
1 3


Your Task:
You dont need to read input or print anything. Complete the function rotateby90() which takes the matrix as input parameter and rotates it by 90 degrees in anti-clockwise direction without using any extra space. You have to modify the input matrix in-place

Expected Time Complexity: O(N2)
Expected Auxiliary Space: O(1)


Constraints:
1 ≤ N ≤ 100
1 <= matrix[][] <= 1000

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Rotate by 90 degree

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