leetcode-problemset/算法题/delete-columns-to-make-sorted-iii.json

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            "title": "Delete Columns to Make Sorted III",
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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>We may choose any deletion indices, and we delete all the characters in those indices for each string.</p>\n\n<p>For example, if we have <code>strs = [&quot;abcdef&quot;,&quot;uvwxyz&quot;]</code> and deletion indices <code>{0, 2, 3}</code>, then the final array after deletions is <code>[&quot;bef&quot;, &quot;vyz&quot;]</code>.</p>\n\n<p>Suppose we chose a set of deletion indices <code>answer</code> such that after deletions, the final array has <strong>every string (row) in lexicographic</strong> order. (i.e., <code>(strs[0][0] &lt;= strs[0][1] &lt;= ... &lt;= strs[0][strs[0].length - 1])</code>, and <code>(strs[1][0] &lt;= strs[1][1] &lt;= ... &lt;= strs[1][strs[1].length - 1])</code>, and so on). Return <em>the minimum possible value of</em> <code>answer.length</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = [&quot;babca&quot;,&quot;bbazb&quot;]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> After deleting columns 0, 1, and 4, the final array is strs = [&quot;bc&quot;, &quot;az&quot;].\nBoth these rows are individually in lexicographic order (ie. strs[0][0] &lt;= strs[0][1] and strs[1][0] &lt;= strs[1][1]).\nNote that strs[0] &gt; strs[1] - the array strs is not necessarily in lexicographic order.</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = [&quot;edcba&quot;]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> If we delete less than 4 columns, the only row will not be lexicographically sorted.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> strs = [&quot;ghi&quot;,&quot;def&quot;,&quot;abc&quot;]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> All rows are already lexicographically sorted.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == strs.length</code></li>\n\t<li><code>1 &lt;= n &lt;= 100</code></li>\n\t<li><code>1 &lt;= strs[i].length &lt;= 100</code></li>\n\t<li><code>strs[i]</code> consists of lowercase English letters.</li>\n</ul>\n\n<ul>\n\t<li>&nbsp;</li>\n</ul>\n",
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