leetcode-problemset/leetcode/originData/check-if-all-as-appears-before-all-bs.json

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            "title": "Check if All A's Appears Before All B's",
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            "content": "<p>Given a string <code>s</code> consisting of <strong>only</strong> the characters <code>&#39;a&#39;</code> and <code>&#39;b&#39;</code>, return <code>true</code> <em>if <strong>every</strong> </em><code>&#39;a&#39;</code> <em>appears before <strong>every</strong> </em><code>&#39;b&#39;</code><em> in the string</em>. Otherwise, return <code>false</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;aaabbb&quot;\n<strong>Output:</strong> true\n<strong>Explanation:</strong>\nThe &#39;a&#39;s are at indices 0, 1, and 2, while the &#39;b&#39;s are at indices 3, 4, and 5.\nHence, every &#39;a&#39; appears before every &#39;b&#39; and we return true.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;abab&quot;\n<strong>Output:</strong> false\n<strong>Explanation:</strong>\nThere is an &#39;a&#39; at index 2 and a &#39;b&#39; at index 1.\nHence, not every &#39;a&#39; appears before every &#39;b&#39; and we return false.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;bbb&quot;\n<strong>Output:</strong> true\n<strong>Explanation:</strong>\nThere are no &#39;a&#39;s, hence, every &#39;a&#39; appears before every &#39;b&#39; and we return true.\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;= 100</code></li>\n\t<li><code>s[i]</code> is either <code>&#39;a&#39;</code> or <code>&#39;b&#39;</code>.</li>\n</ul>\n",
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            "hints": [
                "You can check the opposite: check if there is a ‘b’ before an ‘a’. Then, negate and return that answer.",
                "s should not have any occurrences of “ba” as a substring."
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