Row Sums Of A Matrix

You are given a rectangular matrix (a list of lists of numbers) with at least one row.

Return a list in which the element at index i is the sum of all numbers in row i of matrix.

The length of the returned list equals the number of rows in matrix.

NOTE: This is a function-type question — you only write the function. Do not read input or print anything; a hidden checker calls your function and checks its return value.

Example

Arguments

[[1, 2], [3, 4]]

Returns

[3, 7]