mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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180 lines
18 KiB
JSON
180 lines
18 KiB
JSON
{
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"question": {
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"questionId": "2465",
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"questionFrontendId": "2381",
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"boundTopicId": null,
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"title": "Shifting Letters II",
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"titleSlug": "shifting-letters-ii",
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"content": "<p>You are given a string <code>s</code> of lowercase English letters and a 2D integer array <code>shifts</code> where <code>shifts[i] = [start<sub>i</sub>, end<sub>i</sub>, direction<sub>i</sub>]</code>. For every <code>i</code>, <strong>shift</strong> the characters in <code>s</code> from the index <code>start<sub>i</sub></code> to the index <code>end<sub>i</sub></code> (<strong>inclusive</strong>) forward if <code>direction<sub>i</sub> = 1</code>, or shift the characters backward if <code>direction<sub>i</sub> = 0</code>.</p>\n\n<p>Shifting a character <strong>forward</strong> means replacing it with the <strong>next</strong> letter in the alphabet (wrapping around so that <code>'z'</code> becomes <code>'a'</code>). Similarly, shifting a character <strong>backward</strong> means replacing it with the <strong>previous</strong> letter in the alphabet (wrapping around so that <code>'a'</code> becomes <code>'z'</code>).</p>\n\n<p>Return <em>the final string after all such shifts to </em><code>s</code><em> are applied</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "abc", shifts = [[0,1,0],[1,2,1],[0,2,1]]\n<strong>Output:</strong> "ace"\n<strong>Explanation:</strong> Firstly, shift the characters from index 0 to index 1 backward. Now s = "zac".\nSecondly, shift the characters from index 1 to index 2 forward. Now s = "zbd".\nFinally, shift the characters from index 0 to index 2 forward. Now s = "ace".</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "dztz", shifts = [[0,0,0],[1,1,1]]\n<strong>Output:</strong> "catz"\n<strong>Explanation:</strong> Firstly, shift the characters from index 0 to index 0 backward. Now s = "cztz".\nFinally, shift the characters from index 1 to index 1 forward. Now s = "catz".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length, shifts.length <= 5 * 10<sup>4</sup></code></li>\n\t<li><code>shifts[i].length == 3</code></li>\n\t<li><code>0 <= start<sub>i</sub> <= end<sub>i</sub> < s.length</code></li>\n\t<li><code>0 <= direction<sub>i</sub> <= 1</code></li>\n\t<li><code>s</code> consists of lowercase English letters.</li>\n</ul>\n",
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"difficulty": "Medium",
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"exampleTestcases": "\"abc\"\n[[0,1,0],[1,2,1],[0,2,1]]\n\"dztz\"\n[[0,0,0],[1,1,1]]",
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"categoryTitle": "Algorithms",
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},
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"name": "Prefix Sum",
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"code": "class Solution {\npublic:\n string shiftingLetters(string s, vector<vector<int>>& shifts) {\n \n }\n};",
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"code": "class Solution {\n public String shiftingLetters(String s, int[][] shifts) {\n \n }\n}",
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"code": "class Solution(object):\n def shiftingLetters(self, s, shifts):\n \"\"\"\n :type s: str\n :type shifts: List[List[int]]\n :rtype: str\n \"\"\"\n ",
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"code": "class Solution:\n def shiftingLetters(self, s: str, shifts: List[List[int]]) -> str:\n ",
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"code": "char* shiftingLetters(char* s, int** shifts, int shiftsSize, int* shiftsColSize) {\n \n}",
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"code": "/**\n * @param {string} s\n * @param {number[][]} shifts\n * @return {string}\n */\nvar shiftingLetters = function(s, shifts) {\n \n};",
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"code": "class Solution {\n\n /**\n * @param String $s\n * @param Integer[][] $shifts\n * @return String\n */\n function shiftingLetters($s, $shifts) {\n \n }\n}",
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"lang": "Swift",
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"code": "class Solution {\n func shiftingLetters(_ s: String, _ shifts: [[Int]]) -> String {\n \n }\n}",
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"lang": "Kotlin",
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"langSlug": "kotlin",
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"code": "class Solution {\n fun shiftingLetters(s: String, shifts: Array<IntArray>): String {\n \n }\n}",
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"lang": "Dart",
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"code": "class Solution {\n String shiftingLetters(String s, List<List<int>> shifts) {\n \n }\n}",
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"lang": "Go",
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"code": "func shiftingLetters(s string, shifts [][]int) string {\n \n}",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {String} s\n# @param {Integer[][]} shifts\n# @return {String}\ndef shifting_letters(s, shifts)\n \nend",
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"code": "object Solution {\n def shiftingLetters(s: String, shifts: Array[Array[Int]]): String = {\n \n }\n}",
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"code": "impl Solution {\n pub fn shifting_letters(s: String, shifts: Vec<Vec<i32>>) -> String {\n \n }\n}",
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"code": "(define/contract (shifting-letters s shifts)\n (-> string? (listof (listof exact-integer?)) string?)\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec shifting_letters(S :: unicode:unicode_binary(), Shifts :: [[integer()]]) -> unicode:unicode_binary().\nshifting_letters(S, Shifts) ->\n .",
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"code": "defmodule Solution do\n @spec shifting_letters(s :: String.t, shifts :: [[integer]]) :: String.t\n def shifting_letters(s, shifts) do\n \n end\nend",
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"hints": [
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"Instead of shifting every character in each shift, could you keep track of which characters are shifted and by how much across all shifts?",
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"Try marking the start and ends of each shift, then perform a prefix sum of the shifts."
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],
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