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"boundTopicId": null,
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"title": "Find Palindrome With Fixed Length",
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"titleSlug": "find-palindrome-with-fixed-length",
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"content": "<p>Given an integer array <code>queries</code> and a <strong>positive</strong> integer <code>intLength</code>, return <em>an array</em> <code>answer</code> <em>where</em> <code>answer[i]</code> <em>is either the </em><code>queries[i]<sup>th</sup></code> <em>smallest <strong>positive palindrome</strong> of length</em> <code>intLength</code> <em>or</em> <code>-1</code><em> if no such palindrome exists</em>.</p>\n\n<p>A <strong>palindrome</strong> is a number that reads the same backwards and forwards. Palindromes cannot have leading zeros.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> queries = [1,2,3,4,5,90], intLength = 3\n<strong>Output:</strong> [101,111,121,131,141,999]\n<strong>Explanation:</strong>\nThe first few palindromes of length 3 are:\n101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 201, ...\nThe 90<sup>th</sup> palindrome of length 3 is 999.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> queries = [2,4,6], intLength = 4\n<strong>Output:</strong> [1111,1331,1551]\n<strong>Explanation:</strong>\nThe first six palindromes of length 4 are:\n1001, 1111, 1221, 1331, 1441, and 1551.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= queries.length <= 5 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= queries[i] <= 10<sup>9</sup></code></li>\n\t<li><code>1 <= intLength <= 15</code></li>\n</ul>\n",
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"content": "<p>Given an integer array <code>queries</code> and a <strong>positive</strong> integer <code>intLength</code>, return <em>an array</em> <code>answer</code> <em>where</em> <code>answer[i]</code> <em>is either the </em><code>queries[i]<sup>th</sup></code> <em>smallest <strong>positive palindrome</strong> of length</em> <code>intLength</code> <em>or</em> <code>-1</code><em> if no such palindrome exists</em>.</p>\n\n<p>A <strong>palindrome</strong> is a number that reads the same backwards and forwards. Palindromes cannot have leading zeros.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> queries = [1,2,3,4,5,90], intLength = 3\n<strong>Output:</strong> [101,111,121,131,141,999]\n<strong>Explanation:</strong>\nThe first few palindromes of length 3 are:\n101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, ...\nThe 90<sup>th</sup> palindrome of length 3 is 999.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> queries = [2,4,6], intLength = 4\n<strong>Output:</strong> [1111,1331,1551]\n<strong>Explanation:</strong>\nThe first six palindromes of length 4 are:\n1001, 1111, 1221, 1331, 1441, and 1551.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= queries.length <= 5 * 10<sup>4</sup></code></li>\n\t<li><code>1 <= queries[i] <= 10<sup>9</sup></code></li>\n\t<li><code>1 <= intLength <= 15</code></li>\n</ul>\n",
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"translatedTitle": null,
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"translatedContent": null,
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"isPaidOnly": false,
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"difficulty": "Medium",
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"likes": 107,
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"dislikes": 106,
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"likes": 227,
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"dislikes": 137,
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"similarQuestions": "[{\"title\": \"Palindrome Number\", \"titleSlug\": \"palindrome-number\", \"difficulty\": \"Easy\", \"translatedTitle\": null}, {\"title\": \"Find the Closest Palindrome\", \"titleSlug\": \"find-the-closest-palindrome\", \"difficulty\": \"Hard\", \"translatedTitle\": null}]",
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"exampleTestcases": "[1,2,3,4,5,90]\n3\n[2,4,6]\n4",
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@@ -137,7 +137,7 @@
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"__typename": "CodeSnippetNode"
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}
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],
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"hints": [
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"For any value of queries[i] and intLength, how can you check if there exists at least queries[i] palindromes of length intLength?",
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"Since a palindrome reads the same forwards and backwards, consider how you can efficiently find the first half (ceil(intLength/2) digits) of the palindrome."
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