Given a non null integer matrix Grid of dimensions NxM.Calculate the sum of its elements.
Input: N=2,M=3 Grid= [[1,0,1], [-8,9,-2]] Output: 1 Explanation: The sum of all elements of the matrix is (1+0+1-8+9-2)=1.
Input: N=3,M=5 Grid= [[1,0,1,0,1], [0,1,0,1,0], [-1,-1,-1,-1,-1]] Output: 0 Explanation: The sum of all elements of the matrix are (1+0+1+0+1+0+1+0+1+0-1-1-1-1-1)=0.
You don't need to read input or print anything.Your task is to complete the function sumOfMatrix() which takes two integers N ,M and a 2D array Grid as input parameters and returns the sum of all the elements of the Grid.
Expected Time Complexity:O(N*M)
Expected Auxillary Space:O(1)
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