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            "title": "Minimum Number of Swaps to Make the String Balanced",
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            "content": "<p>You are given a <strong>0-indexed</strong> string <code>s</code> of <strong>even</strong> length <code>n</code>. The string consists of <strong>exactly</strong> <code>n / 2</code> opening brackets <code>&#39;[&#39;</code> and <code>n / 2</code> closing brackets <code>&#39;]&#39;</code>.</p>\n\n<p>A string is called <strong>balanced</strong> if and only if:</p>\n\n<ul>\n\t<li>It is the empty string, or</li>\n\t<li>It can be written as <code>AB</code>, where both <code>A</code> and <code>B</code> are <strong>balanced</strong> strings, or</li>\n\t<li>It can be written as <code>[C]</code>, where <code>C</code> is a <strong>balanced</strong> string.</li>\n</ul>\n\n<p>You may swap the brackets at <strong>any</strong> two indices <strong>any</strong> number of times.</p>\n\n<p>Return <em>the <strong>minimum</strong> number of swaps to make </em><code>s</code> <em><strong>balanced</strong></em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;][][&quot;\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> You can make the string balanced by swapping index 0 with index 3.\nThe resulting string is &quot;[[]]&quot;.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;]]][[[&quot;\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> You can do the following to make the string balanced:\n- Swap index 0 with index 4. s = &quot;[]][][&quot;.\n- Swap index 1 with index 5. s = &quot;[[][]]&quot;.\nThe resulting string is &quot;[[][]]&quot;.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;[]&quot;\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> The string is already balanced.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == s.length</code></li>\n\t<li><code>2 &lt;= n &lt;= 10<sup>6</sup></code></li>\n\t<li><code>n</code> is even.</li>\n\t<li><code>s[i]</code> is either <code>&#39;[&#39; </code>or <code>&#39;]&#39;</code>.</li>\n\t<li>The number of opening brackets <code>&#39;[&#39;</code> equals <code>n / 2</code>, and the number of closing brackets <code>&#39;]&#39;</code> equals <code>n / 2</code>.</li>\n</ul>\n",
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            "hints": [
                "Iterate over the string and keep track of the number of opening and closing brackets on each step.",
                "If the number of closing brackets is ever larger, you need to make a swap.",
                "Swap it with the opening bracket closest to the end of s."
            ],
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