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delete-columns-to-make-sorted.json
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"title": "Delete Columns to Make Sorted",
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"content": "<p>You are given an array of <code>n</code> strings <code>strs</code>, all of the same length.</p>\n\n<p>The strings can be arranged such that there is one on each line, making a grid. For example, <code>strs = ["abc", "bce", "cae"]</code> can be arranged as:</p>\n\n<pre>\nabc\nbce\ncae\n</pre>\n\n<p>You want to <strong>delete</strong> the columns that are <strong>not sorted lexicographically</strong>. In the above example (0-indexed), columns 0 (<code>'a'</code>, <code>'b'</code>, <code>'c'</code>) and 2 (<code>'c'</code>, <code>'e'</code>, <code>'e'</code>) are sorted while column 1 (<code>'b'</code>, <code>'c'</code>, <code>'a'</code>) is not, so you would delete column 1.</p>\n\n<p>Return <em>the number of columns that you will delete</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = ["cba","daf","ghi"]\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> The grid looks as follows:\n cba\n daf\n ghi\nColumns 0 and 2 are sorted, but column 1 is not, so you only need to delete 1 column.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = ["a","b"]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> The grid looks as follows:\n a\n b\nColumn 0 is the only column and is sorted, so you will not delete any columns.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = ["zyx","wvu","tsr"]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The grid looks as follows:\n zyx\n wvu\n tsr\nAll 3 columns are not sorted, so you will delete all 3.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == strs.length</code></li>\n\t<li><code>1 <= n <= 100</code></li>\n\t<li><code>1 <= strs[i].length <= 1000</code></li>\n\t<li><code>strs[i]</code> consists of lowercase English letters.</li>\n</ul>\n",
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