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leetcode-problemset/leetcode/originData/find-the-longest-balanced-substring-of-a-binary-string.json
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"title": "Find the Longest Balanced Substring of a Binary String",
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"content": "<p>You are given a binary string <code>s</code> consisting only of zeroes and ones.</p>\n\n<p>A substring of <code>s</code> is considered balanced if<strong> all zeroes are before ones</strong> and the number of zeroes is equal to the number of ones inside the substring. Notice that the empty substring is considered a balanced substring.</p>\n\n<p>Return <em>the length of the longest balanced substring of </em><code>s</code>.</p>\n\n<p>A <b>substring</b> is a contiguous sequence of characters within a string.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;01000111&quot;\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> The longest balanced substring is &quot;000111&quot;, which has length 6.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;00111&quot;\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> The longest balanced substring is &quot;0011&quot;, which has length 4.&nbsp;\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;111&quot;\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There is no balanced substring except the empty substring, so the answer is 0.\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;= 50</code></li>\n\t<li><code>&#39;0&#39; &lt;= s[i] &lt;= &#39;1&#39;</code></li>\n</ul>\n",
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"hints": [
"Consider iterating over each subarray and checking if its balanced or not.",
"Among all balanced subarrays, the answer is the longest one of them."
],
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