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            "title": "Largest Number After Mutating Substring",
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            "content": "<p>You are given a string <code>num</code>, which represents a large integer. You are also given a <strong>0-indexed</strong> integer array <code>change</code> of length <code>10</code> that maps each digit <code>0-9</code> to another digit. More formally, digit <code>d</code> maps to digit <code>change[d]</code>.</p>\n\n<p>You may <strong>choose</strong> to <b>mutate a single substring</b> of <code>num</code>. To mutate a substring, replace each digit <code>num[i]</code> with the digit it maps to in <code>change</code> (i.e. replace <code>num[i]</code> with <code>change[num[i]]</code>).</p>\n\n<p>Return <em>a string representing the <strong>largest</strong> possible integer after <strong>mutating</strong> (or choosing not to) a <strong>single substring</strong> of </em><code>num</code>.</p>\n\n<p>A <strong>substring</strong> is a contiguous sequence of characters within the string.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = &quot;<u>1</u>32&quot;, change = [9,8,5,0,3,6,4,2,6,8]\n<strong>Output:</strong> &quot;<u>8</u>32&quot;\n<strong>Explanation:</strong> Replace the substring &quot;1&quot;:\n- 1 maps to change[1] = 8.\nThus, &quot;<u>1</u>32&quot; becomes &quot;<u>8</u>32&quot;.\n&quot;832&quot; is the largest number that can be created, so return it.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = &quot;<u>021</u>&quot;, change = [9,4,3,5,7,2,1,9,0,6]\n<strong>Output:</strong> &quot;<u>934</u>&quot;\n<strong>Explanation:</strong> Replace the substring &quot;021&quot;:\n- 0 maps to change[0] = 9.\n- 2 maps to change[2] = 3.\n- 1 maps to change[1] = 4.\nThus, &quot;<u>021</u>&quot; becomes &quot;<u>934</u>&quot;.\n&quot;934&quot; is the largest number that can be created, so return it.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = &quot;5&quot;, change = [1,4,7,5,3,2,5,6,9,4]\n<strong>Output:</strong> &quot;5&quot;\n<strong>Explanation:</strong> &quot;5&quot; is already the largest number that can be created, so return it.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= num.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>num</code> consists of only digits <code>0-9</code>.</li>\n\t<li><code>change.length == 10</code></li>\n\t<li><code>0 &lt;= change[d] &lt;= 9</code></li>\n</ul>\n",
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                "Should you change a digit if the new digit is smaller than the original?",
                "If changing the first digit and the last digit both make the number bigger, but you can only change one of them; which one should you change?",
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