equal-row-and-column-pairs

Equal Row and Column Pairs

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equalPairs

Given a 0-indexed <code>n x n</code> integer matrix <code>grid</code>, return the number of pairs <code>(ri, cj)</code> such that row <code>ri</code> and column <code>cj</code> are equal.

A row and column pair is considered equal if they contain the same elements in the same order (i.e., an equal array).

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2022/06/01/ex1.jpg" style="width: 150px; height: 153px;" />
<pre>
Input: grid = [[3,2,1],[1,7,6],[2,7,7]]
Output: 1
Explanation: There is 1 equal row and column pair:
- (Row 2, Column 1): [2,7,7]
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2022/06/01/ex2.jpg" style="width: 200px; height: 209px;" />
<pre>
Input: grid = [[3,1,2,2],[1,4,4,5],[2,4,2,2],[2,4,2,2]]
Output: 3
Explanation: There are 3 equal row and column pairs:
- (Row 0, Column 0): [3,1,2,2]
- (Row 2, Column 2): [2,4,2,2]
- (Row 3, Column 2): [2,4,2,2]
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>n == grid.length == grid[i].length</code></li>
	<li><code>1 &lt;= n &lt;= 200</code></li>
	<li><code>1 &lt;= grid[i][j] &lt;= 105</code></li>
</ul>

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