mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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186 lines
17 KiB
JSON
186 lines
17 KiB
JSON
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"questionId": "2456",
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"title": "Construct Smallest Number From DI String",
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"content": "<p>You are given a <strong>0-indexed</strong> string <code>pattern</code> of length <code>n</code> consisting of the characters <code>'I'</code> meaning <strong>increasing</strong> and <code>'D'</code> meaning <strong>decreasing</strong>.</p>\n\n<p>A <strong>0-indexed</strong> string <code>num</code> of length <code>n + 1</code> is created using the following conditions:</p>\n\n<ul>\n\t<li><code>num</code> consists of the digits <code>'1'</code> to <code>'9'</code>, where each digit is used <strong>at most</strong> once.</li>\n\t<li>If <code>pattern[i] == 'I'</code>, then <code>num[i] < num[i + 1]</code>.</li>\n\t<li>If <code>pattern[i] == 'D'</code>, then <code>num[i] > num[i + 1]</code>.</li>\n</ul>\n\n<p>Return <em>the lexicographically <strong>smallest</strong> possible string </em><code>num</code><em> that meets the conditions.</em></p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> pattern = "IIIDIDDD"\n<strong>Output:</strong> "123549876"\n<strong>Explanation:\n</strong>At indices 0, 1, 2, and 4 we must have that num[i] < num[i+1].\nAt indices 3, 5, 6, and 7 we must have that num[i] > num[i+1].\nSome possible values of num are "245639871", "135749862", and "123849765".\nIt can be proven that "123549876" is the smallest possible num that meets the conditions.\nNote that "123414321" is not possible because the digit '1' is used more than once.</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> pattern = "DDD"\n<strong>Output:</strong> "4321"\n<strong>Explanation:</strong>\nSome possible values of num are "9876", "7321", and "8742".\nIt can be proven that "4321" is the smallest possible num that meets the conditions.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= pattern.length <= 8</code></li>\n\t<li><code>pattern</code> consists of only the letters <code>'I'</code> and <code>'D'</code>.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"IIIDIDDD\"\n\"DDD\"",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\n public String smallestNumber(String pattern) {\n \n }\n}",
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"code": "class Solution(object):\n def smallestNumber(self, pattern):\n \"\"\"\n :type pattern: str\n :rtype: str\n \"\"\"\n ",
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"code": "# @param {String} pattern\n# @return {String}\ndef smallest_number(pattern)\n \nend",
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"code": "object Solution {\n def smallestNumber(pattern: String): String = {\n \n }\n}",
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"code": "impl Solution {\n pub fn smallest_number(pattern: String) -> String {\n \n }\n}",
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"code": "(define/contract (smallest-number pattern)\n (-> string? string?)\n )",
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"lang": "Erlang",
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"code": "-spec smallest_number(Pattern :: unicode:unicode_binary()) -> unicode:unicode_binary().\nsmallest_number(Pattern) ->\n .",
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"code": "defmodule Solution do\n @spec smallest_number(pattern :: String.t) :: String.t\n def smallest_number(pattern) do\n \n end\nend",
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"hints": [
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"With the constraints, could we generate every possible string?",
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"Yes we can. Now we just need to check if the string meets all the conditions."
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "\"IIIDIDDD\"",
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"metaData": "{\n \"name\": \"smallestNumber\",\n \"params\": [\n {\n \"name\": \"pattern\",\n \"type\": \"string\"\n }\n ],\n \"return\": {\n \"type\": \"string\"\n }\n}",
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