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45 lines
2.2 KiB
HTML
45 lines
2.2 KiB
HTML
<p>You are given a string <code>s</code>. Reorder the string using the following algorithm:</p>
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<ol>
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<li>Pick the <strong>smallest</strong> character from <code>s</code> and <strong>append</strong> it to the result.</li>
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<li>Pick the <strong>smallest</strong> character from <code>s</code> which is greater than the last appended character to the result and <strong>append</strong> it.</li>
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<li>Repeat step 2 until you cannot pick more characters.</li>
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<li>Pick the <strong>largest</strong> character from <code>s</code> and <strong>append</strong> it to the result.</li>
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<li>Pick the <strong>largest</strong> character from <code>s</code> which is smaller than the last appended character to the result and <strong>append</strong> it.</li>
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<li>Repeat step 5 until you cannot pick more characters.</li>
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<li>Repeat the steps from 1 to 6 until you pick all characters from <code>s</code>.</li>
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</ol>
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<p>In each step, If the smallest or the largest character appears more than once you can choose any occurrence and append it to the result.</p>
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<p>Return <em>the result string after sorting </em><code>s</code><em> with this algorithm</em>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> s = "aaaabbbbcccc"
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<strong>Output:</strong> "abccbaabccba"
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<strong>Explanation:</strong> After steps 1, 2 and 3 of the first iteration, result = "abc"
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After steps 4, 5 and 6 of the first iteration, result = "abccba"
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First iteration is done. Now s = "aabbcc" and we go back to step 1
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After steps 1, 2 and 3 of the second iteration, result = "abccbaabc"
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After steps 4, 5 and 6 of the second iteration, result = "abccbaabccba"
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s = "rat"
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<strong>Output:</strong> "art"
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<strong>Explanation:</strong> The word "rat" becomes "art" after re-ordering it with the mentioned algorithm.
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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>1 <= s.length <= 500</code></li>
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<li><code>s</code> consists of only lowercase English letters.</li>
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</ul>
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