flip-columns-for-maximum-number-of-equal-rows.md

<p>Given a <code>matrix</code> consisting of 0s and 1s, we may choose any number of columns in the matrix and flip <strong>every</strong>&nbsp;cell in that column.&nbsp; Flipping a cell changes the value of that cell from 0 to 1 or from 1 to 0.</p>

<p>Return the maximum number of rows that have all values equal after some number of flips.</p>

<p>&nbsp;</p>

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<p><strong>Example 1:</strong></p>

<pre>
<strong>Input: </strong><span id="example-input-1-1">[[0,1],[1,1]]</span>
<strong>Output: </strong><span id="example-output-1">1</span>
<strong>Explanation: </strong>After flipping no values, 1 row has all values equal.
</pre>

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<p><strong>Example 2:</strong></p>

<pre>
<strong>Input: </strong><span id="example-input-2-1">[[0,1],[1,0]]</span>
<strong>Output: </strong><span id="example-output-2">2</span>
<strong>Explanation: </strong>After flipping values in the first column, both rows have equal values.
</pre>

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<p><strong>Example 3:</strong></p>

<pre>
<strong>Input: </strong><span id="example-input-3-1">[[0,0,0],[0,0,1],[1,1,0]]</span>
<strong>Output: </strong><span id="example-output-3">2</span>
<strong>Explanation: </strong>After flipping values in the first two columns, the last two rows have equal values.
</pre>

<p>&nbsp;</p>

<p><strong>Note:</strong></p>

<ol>
	<li><code>1 &lt;= matrix.length &lt;= 300</code></li>
	<li><code>1 &lt;= matrix[i].length &lt;= 300</code></li>
	<li>All <code>matrix[i].length</code>&#39;s are equal</li>
	<li><code>matrix[i][j]</code> is&nbsp;<code>0</code> or <code>1</code></li>
</ol>
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