You are given two arrays of nonnegative integers rowSum and colSum, where rowSum[i] represents the required sum of the elements in the $i^{ ext{th}}$ row and colSum[j] represents the required sum of the elements in the $j^{ ext{th}}$ column of a $2 ext{D}$ matrix.

Construct and return a $2 ext{D}$ matrix of dimensions rowSum.length $ imes$ colSum.length consisting of nonnegative integers that satisfies the given row and column sums.

Note: If multiple valid matrices exist, you may return any of them.

Constraints:

• $1 \leq$ rowSum.length, colSum.length $\leq 500$

• $0 \leq$ rowSum[i], colSum[i] $\leq 10^8$

• sum(rowSum) $==$ sum(colSum)

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