Column Sum

Problem Description

You are given a 2D integer matrix A, return a 1D integer array containing column-wise sums of original matrix.

1 <= A.size() <= 10^3
1 <= A[i].size() <= 10^3
1 <= A[i][j] <= 10^3

First argument is a 2D array of integers.(2D matrix).

Return an array containing column-wise sums of original matrix.

Input 1:
[1,2,3,4]
[5,6,7,8]
[9,2,3,4]

Output 1:
{15,10,13,16}

Explanation 1:
Column 1 = 1+5+9 = 15
Column 2 = 2+6+2 = 10
Column 3 = 3+7+3 = 13
Column 4 = 4+8+4 = 16

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