#654 · #2392 · Build a Matrix With Conditions(给定条件下构造矩阵)

You are given a positive integer k, rowConditions where rowConditions[i] = [above, below] means the value above must be in a row strictly above below, and similarly colConditions. Return a k x k matrix containing 1..k satisfying both, or an empty matrix if impossible. Constraints: 2 <= k <= 400, 1 <= rowConditions.length, colConditions.length <= 10^4.