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            "title": "Increasing Decreasing String",
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            "content": "<p>You are given a string <code>s</code>. Reorder the string using the following algorithm:</p>\n\n<ol>\n\t<li>Pick the <strong>smallest</strong> character from <code>s</code> and <strong>append</strong> it to the result.</li>\n\t<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>\n\t<li>Repeat step 2 until you cannot pick more characters.</li>\n\t<li>Pick the <strong>largest</strong> character from <code>s</code> and <strong>append</strong> it to the result.</li>\n\t<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>\n\t<li>Repeat step 5 until you cannot pick more characters.</li>\n\t<li>Repeat the steps from 1 to 6 until you pick all characters from <code>s</code>.</li>\n</ol>\n\n<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>\n\n<p>Return <em>the result string after sorting </em><code>s</code><em> with this algorithm</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aaaabbbbcccc&quot;\n<strong>Output:</strong> &quot;abccbaabccba&quot;\n<strong>Explanation:</strong> After steps 1, 2 and 3 of the first iteration, result = &quot;abc&quot;\nAfter steps 4, 5 and 6 of the first iteration, result = &quot;abccba&quot;\nFirst iteration is done. Now s = &quot;aabbcc&quot; and we go back to step 1\nAfter steps 1, 2 and 3 of the second iteration, result = &quot;abccbaabc&quot;\nAfter steps 4, 5 and 6 of the second iteration, result = &quot;abccbaabccba&quot;\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;rat&quot;\n<strong>Output:</strong> &quot;art&quot;\n<strong>Explanation:</strong> The word &quot;rat&quot; becomes &quot;art&quot; after re-ordering it with the mentioned algorithm.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 500</code></li>\n\t<li><code>s</code> consists of only lowercase English letters.</li>\n</ul>\n",
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                "Count the frequency of each character.",
                "Loop over all character from 'a' to 'z' and append the character if it exists and decrease frequency by 1. Do the same from 'z' to 'a'.",
                "Keep repeating until the frequency of all characters is zero."
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            "sampleTestCase": "\"aaaabbbbcccc\"",
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