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"content": "<p>Given a string <code>columnTitle</code> that represents the column title as appear in an Excel sheet, return <em>its corresponding column number</em>.</p>\n\n<p>For example:</p>\n\n<pre>\nA -> 1\nB -> 2\nC -> 3\n...\nZ -> 26\nAA -> 27\nAB -> 28 \n...\n</pre>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> columnTitle = "A"\n<strong>Output:</strong> 1\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> columnTitle = "AB"\n<strong>Output:</strong> 28\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> columnTitle = "ZY"\n<strong>Output:</strong> 701\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= columnTitle.length <= 7</code></li>\n\t<li><code>columnTitle</code> consists only of uppercase English letters.</li>\n\t<li><code>columnTitle</code> is in the range <code>["A", "FXSHRXW"]</code>.</li>\n</ul>\n",
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