leetcode-problemset/leetcode/originData/digit-operations-to-make-two-integers-equal.json

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            "title": "Digit Operations to Make Two Integers Equal",
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            "content": "<p>You are given two integers <code>n</code> and <code>m</code> that consist of the <strong>same</strong> number of digits.</p>\n\n<p>You can perform the following operations <strong>any</strong> number of times:</p>\n\n<ul>\n\t<li>Choose <strong>any</strong> digit from <code>n</code> that is not 9 and <strong>increase</strong> it by 1.</li>\n\t<li>Choose <strong>any</strong> digit from <code>n</code> that is not 0 and <strong>decrease</strong> it by 1.</li>\n</ul>\n\n<p>The integer <code>n</code> must not be a <span data-keyword=\"prime-number\">prime</span> number at any point, including its original value and after each operation.</p>\n\n<p>The cost of a transformation is the sum of <strong>all</strong> values that <code>n</code> takes throughout the operations performed.</p>\n\n<p>Return the <strong>minimum</strong> cost to transform <code>n</code> into <code>m</code>. If it is impossible, return -1.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 10, m = 12</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">85</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>We perform the following operations:</p>\n\n<ul>\n\t<li>Increase the first digit, now <code>n = <u><strong>2</strong></u>0</code>.</li>\n\t<li>Increase the second digit, now <code>n = 2<strong><u>1</u></strong></code>.</li>\n\t<li>Increase the second digit, now <code>n = 2<strong><u>2</u></strong></code>.</li>\n\t<li>Decrease the first digit, now <code>n = <strong><u>1</u></strong>2</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 4, m = 8</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">-1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>It is impossible to make <code>n</code> equal to <code>m</code>.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">n = 6, m = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">-1</span></p>\n\n<p><strong>Explanation:</strong>&nbsp;</p>\n\n<p>Since 2 is already a prime, we can&#39;t make <code>n</code> equal to <code>m</code>.</p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n, m &lt; 10<sup>4</sup></code></li>\n\t<li><code>n</code> and <code>m</code> consist of the same number of digits.</li>\n</ul>\n",
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