build-a-matrix-with-conditions

Build a Matrix With Conditions

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buildMatrix

You are given a positive integer <code>k</code>. You are also given:

<ul>
	<li>a 2D integer array <code>rowConditions</code> of size <code>n</code> where <code>rowConditions[i] = [abovei, belowi]</code>, and</li>
	<li>a 2D integer array <code>colConditions</code> of size <code>m</code> where <code>colConditions[i] = [lefti, righti]</code>.</li>
</ul>

The two arrays contain integers from <code>1</code> to <code>k</code>.

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

The matrix should also satisfy the following conditions:

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

Return any matrix that satisfies the conditions. If no answer exists, return an empty matrix.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2022/07/06/gridosdrawio.png" style="width: 211px; height: 211px;" />
<pre>
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.
</pre>

Example 2:

<pre>
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.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>2 &lt;= k &lt;= 400</code></li>
	<li><code>1 &lt;= rowConditions.length, colConditions.length &lt;= 104</code></li>
	<li><code>rowConditions[i].length == colConditions[i].length == 2</code></li>
	<li><code>1 &lt;= abovei, belowi, lefti, righti &lt;= k</code></li>
	<li><code>abovei != belowi</code></li>
	<li><code>lefti != righti</code></li>
</ul>

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