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2352-equal-row-and-column-pairs/README.md

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+<h2><a href="https://leetcode.com/problems/equal-row-and-column-pairs">2352. Equal Row and Column Pairs</a></h2><h3>Medium</h3><hr><p>Given a <strong>0-indexed</strong> <code>n x n</code> integer matrix <code>grid</code>, <em>return the number of pairs </em><code>(r<sub>i</sub>, c<sub>j</sub>)</code><em> such that row </em><code>r<sub>i</sub></code><em> and column </em><code>c<sub>j</sub></code><em> are equal</em>.</p>
+
+<p>A row and column pair is considered equal if they contain the same elements in the same order (i.e., an equal array).</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2022/06/01/ex1.jpg" style="width: 150px; height: 153px;" />
+<pre>
+<strong>Input:</strong> grid = [[3,2,1],[1,7,6],[2,7,7]]
+<strong>Output:</strong> 1
+<strong>Explanation:</strong> There is 1 equal row and column pair:
+- (Row 2, Column 1): [2,7,7]
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2022/06/01/ex2.jpg" style="width: 200px; height: 209px;" />
+<pre>
+<strong>Input:</strong> grid = [[3,1,2,2],[1,4,4,5],[2,4,2,2],[2,4,2,2]]
+<strong>Output:</strong> 3
+<strong>Explanation:</strong> 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>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<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;= 10<sup>5</sup></code></li>
+</ul>