mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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168 lines
16 KiB
JSON
168 lines
16 KiB
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>'a'</code> and <code>'b'</code>, return <code>true</code> <em>if <strong>every</strong> </em><code>'a'</code> <em>appears before <strong>every</strong> </em><code>'b'</code><em> in the string</em>. Otherwise, return <code>false</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "aaabbb"\n<strong>Output:</strong> true\n<strong>Explanation:</strong>\nThe 'a's are at indices 0, 1, and 2, while the 'b's are at indices 3, 4, and 5.\nHence, every 'a' appears before every 'b' and we return true.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "abab"\n<strong>Output:</strong> false\n<strong>Explanation:</strong>\nThere is an 'a' at index 2 and a 'b' at index 1.\nHence, not every 'a' appears before every 'b' and we return false.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "bbb"\n<strong>Output:</strong> true\n<strong>Explanation:</strong>\nThere are no 'a's, hence, every 'a' appears before every 'b' and we return true.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 100</code></li>\n\t<li><code>s[i]</code> is either <code>'a'</code> or <code>'b'</code>.</li>\n</ul>\n",
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"You can check the opposite: check if there is a ‘b’ before an ‘a’. Then, negate and return that answer.",
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"s should not have any occurrences of “ba” as a substring."
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