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g2301_2400.s2392_build_a_matrix_with_conditions.readme.md Maven / Gradle / Ivy

2392\. Build a Matrix With Conditions

Hard

You are given a **positive** integer `k`. You are also given:

*   a 2D integer array `rowConditions` of size `n` where rowConditions[i] = [abovei, belowi], and
*   a 2D integer array `colConditions` of size `m` where colConditions[i] = [lefti, righti].

The two arrays contain integers from `1` to `k`.

You have to build a `k x k` matrix that contains each of the numbers from `1` to `k` **exactly once**. The remaining cells should have the value `0`.

The matrix should also satisfy the following conditions:

*   The number abovei should appear in a **row** that is strictly **above** the row at which the number belowi appears for all `i` from `0` to `n - 1`.
*   The number lefti should appear in a **column** that is strictly **left** of the column at which the number righti appears for all `i` from `0` to `m - 1`.

Return _**any** matrix that satisfies the conditions_. If no answer exists, return an empty matrix.

**Example 1:**

![](https://assets.leetcode.com/uploads/2022/07/06/gridosdrawio.png)

**Input:** k = 3, rowConditions = [[1,2],[3,2]], colConditions = [[2,1],[3,2]]

**Output:** [[3,0,0],[0,0,1],[0,2,0]]

**Explanation:** The diagram above shows a valid example of a matrix that satisfies all the conditions.

The row conditions are the following:

- Number 1 is in row 1, and number 2 is in row 2, so 1 is above 2 in the matrix.

- Number 3 is in row 0, and number 2 is in row 2, so 3 is above 2 in the matrix.

The column conditions are the following:

- Number 2 is in column 1, and number 1 is in column 2, so 2 is left of 1 in the matrix.

- Number 3 is in column 0, and number 2 is in column 1, so 3 is left of 2 in the matrix.

Note that there may be multiple correct answers. 

**Example 2:**

**Input:** k = 3, rowConditions = [[1,2],[2,3],[3,1],[2,3]], colConditions = [[2,1]]

**Output:** []

**Explanation:** From the first two conditions, 3 has to be below 1 but the third conditions needs 3 to be above 1 to be satisfied.

No matrix can satisfy all the conditions, so we return the empty matrix. 

**Constraints:**

*   `2 <= k <= 400`
*   1 <= rowConditions.length, colConditions.length <= 104
*   `rowConditions[i].length == colConditions[i].length == 2`
*   1 <= abovei, belowi, lefti, righti <= k
*   abovei != belowi
*   lefti != righti