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60 lines
2.0 KiB
HTML
60 lines
2.0 KiB
HTML
<p>You are given an array of <code>n</code> strings <code>strs</code>, all of the same length.</p>
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<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>
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<pre>
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abc
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bce
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cae
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</pre>
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<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>
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<p>Return <em>the number of columns that you will delete</em>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> strs = ["cba","daf","ghi"]
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<strong>Output:</strong> 1
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<strong>Explanation:</strong> The grid looks as follows:
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cba
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daf
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ghi
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Columns 0 and 2 are sorted, but column 1 is not, so you only need to delete 1 column.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> strs = ["a","b"]
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<strong>Output:</strong> 0
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<strong>Explanation:</strong> The grid looks as follows:
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a
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b
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Column 0 is the only column and is sorted, so you will not delete any columns.
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> strs = ["zyx","wvu","tsr"]
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> The grid looks as follows:
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zyx
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wvu
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tsr
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All 3 columns are not sorted, so you will delete all 3.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>n == strs.length</code></li>
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<li><code>1 <= n <= 100</code></li>
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<li><code>1 <= strs[i].length <= 1000</code></li>
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<li><code>strs[i]</code> consists of lowercase English letters.</li>
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</ul>
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