mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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169 lines
18 KiB
JSON
169 lines
18 KiB
JSON
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"questionId": "2197",
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"title": "Decode the Slanted Ciphertext",
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"titleSlug": "decode-the-slanted-ciphertext",
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"content": "<p>A string <code>originalText</code> is encoded using a <strong>slanted transposition cipher</strong> to a string <code>encodedText</code> with the help of a matrix having a <strong>fixed number of rows</strong> <code>rows</code>.</p>\n\n<p><code>originalText</code> is placed first in a top-left to bottom-right manner.</p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/11/07/exa11.png\" style=\"width: 300px; height: 185px;\" />\n<p>The blue cells are filled first, followed by the red cells, then the yellow cells, and so on, until we reach the end of <code>originalText</code>. The arrow indicates the order in which the cells are filled. All empty cells are filled with <code>' '</code>. The number of columns is chosen such that the rightmost column will <strong>not be empty</strong> after filling in <code>originalText</code>.</p>\n\n<p><code>encodedText</code> is then formed by appending all characters of the matrix in a row-wise fashion.</p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/11/07/exa12.png\" style=\"width: 300px; height: 200px;\" />\n<p>The characters in the blue cells are appended first to <code>encodedText</code>, then the red cells, and so on, and finally the yellow cells. The arrow indicates the order in which the cells are accessed.</p>\n\n<p>For example, if <code>originalText = "cipher"</code> and <code>rows = 3</code>, then we encode it in the following manner:</p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/10/25/desc2.png\" style=\"width: 281px; height: 211px;\" />\n<p>The blue arrows depict how <code>originalText</code> is placed in the matrix, and the red arrows denote the order in which <code>encodedText</code> is formed. In the above example, <code>encodedText = "ch ie pr"</code>.</p>\n\n<p>Given the encoded string <code>encodedText</code> and number of rows <code>rows</code>, return <em>the original string</em> <code>originalText</code>.</p>\n\n<p><strong>Note:</strong> <code>originalText</code> <strong>does not</strong> have any trailing spaces <code>' '</code>. The test cases are generated such that there is only one possible <code>originalText</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> encodedText = "ch ie pr", rows = 3\n<strong>Output:</strong> "cipher"\n<strong>Explanation:</strong> This is the same example described in the problem description.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/10/26/exam1.png\" style=\"width: 250px; height: 168px;\" />\n<pre>\n<strong>Input:</strong> encodedText = "iveo eed l te olc", rows = 4\n<strong>Output:</strong> "i love leetcode"\n<strong>Explanation:</strong> The figure above denotes the matrix that was used to encode originalText. \nThe blue arrows show how we can find originalText from encodedText.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/10/26/eg2.png\" style=\"width: 300px; height: 51px;\" />\n<pre>\n<strong>Input:</strong> encodedText = "coding", rows = 1\n<strong>Output:</strong> "coding"\n<strong>Explanation:</strong> Since there is only 1 row, both originalText and encodedText are the same.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 <= encodedText.length <= 10<sup>6</sup></code></li>\n\t<li><code>encodedText</code> consists of lowercase English letters and <code>' '</code> only.</li>\n\t<li><code>encodedText</code> is a valid encoding of some <code>originalText</code> that <strong>does not</strong> have trailing spaces.</li>\n\t<li><code>1 <= rows <= 1000</code></li>\n\t<li>The testcases are generated such that there is <strong>only one</strong> possible <code>originalText</code>.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"ch ie pr\"\n3\n\"iveo eed l te olc\"\n4\n\"coding\"\n1",
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"categoryTitle": "Algorithms",
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"code": "class Solution {\npublic:\n string decodeCiphertext(string encodedText, int rows) {\n \n }\n};",
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"code": "class Solution {\n public String decodeCiphertext(String encodedText, int rows) {\n \n }\n}",
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"code": "class Solution(object):\n def decodeCiphertext(self, encodedText, rows):\n \"\"\"\n :type encodedText: str\n :type rows: int\n :rtype: str\n \"\"\"\n ",
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"code": "/**\n * @param {string} encodedText\n * @param {number} rows\n * @return {string}\n */\nvar decodeCiphertext = function(encodedText, rows) {\n \n};",
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"code": "# @param {String} encoded_text\n# @param {Integer} rows\n# @return {String}\ndef decode_ciphertext(encoded_text, rows)\n \nend",
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"code": "object Solution {\n def decodeCiphertext(encodedText: String, rows: Int): String = {\n \n }\n}",
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"langSlug": "kotlin",
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"code": "class Solution {\n fun decodeCiphertext(encodedText: String, rows: Int): String {\n \n }\n}",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn decode_ciphertext(encoded_text: String, rows: i32) -> String {\n \n }\n}",
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"code": "class Solution {\n\n /**\n * @param String $encodedText\n * @param Integer $rows\n * @return String\n */\n function decodeCiphertext($encodedText, $rows) {\n \n }\n}",
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"code": "(define/contract (decode-ciphertext encodedText rows)\n (-> string? exact-integer? string?)\n\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec decode_ciphertext(EncodedText :: unicode:unicode_binary(), Rows :: integer()) -> unicode:unicode_binary().\ndecode_ciphertext(EncodedText, Rows) ->\n .",
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"langSlug": "elixir",
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"code": "defmodule Solution do\n @spec decode_ciphertext(encoded_text :: String.t, rows :: integer) :: String.t\n def decode_ciphertext(encoded_text, rows) do\n\n end\nend",
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"hints": [
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"How can you use rows and encodedText to find the number of columns of the matrix?",
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"Once you have the number of rows and columns, you can create the matrix and place encodedText in it. How should you place it in the matrix?",
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"How should you traverse the matrix to \"decode\" originalText?"
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],
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"solution": null,
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"status": null,
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"sampleTestCase": "\"ch ie pr\"\n3",
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