zoukankan      html  css  js  c++  java
  • [Swift]LeetCode1078. Bigram 分词 | Occurrences After Bigram

    ★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★
    ➤微信公众号:山青咏芝(shanqingyongzhi)
    ➤博客园地址:山青咏芝(https://www.cnblogs.com/strengthen/
    ➤GitHub地址:https://github.com/strengthen/LeetCode
    ➤原文地址:https://www.cnblogs.com/strengthen/p/10993147.html 
    ➤如果链接不是山青咏芝的博客园地址,则可能是爬取作者的文章。
    ➤原文已修改更新!强烈建议点击原文地址阅读!支持作者!支持原创!
    ★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★

    Given words first and second, consider occurrences in some text of the form "first second third", where second comes immediately after first, and third comes immediately after second.

    For each such occurrence, add "third" to the answer, and return the answer.

    Example 1:

    Input: text = "alice is a good girl she is a good student", first = "a", second = "good"
    Output: ["girl","student"]
    

    Example 2:

    Input: text = "we will we will rock you", first = "we", second = "will"
    Output: ["we","rock"] 

    Note:

    1. 1 <= text.length <= 1000
    2. text consists of space separated words, where each word consists of lowercase English letters.
    3. 1 <= first.length, second.length <= 10
    4. first and second consist of lowercase English letters.

    给出第一个词 first 和第二个词 second,考虑在某些文本 text 中可能以 "first second third" 形式出现的情况,其中 second 紧随 first 出现,third 紧随 second 出现。

    对于每种这样的情况,将第三个词 "third" 添加到答案中,并返回答案。 

    示例 1:

    输入:text = "alice is a good girl she is a good student", first = "a", second = "good"
    输出:["girl","student"]
    

    示例 2:

    输入:text = "we will we will rock you", first = "we", second = "will"
    输出:["we","rock"] 

    提示:

    1. 1 <= text.length <= 1000
    2. text 由一些用空格分隔的单词组成,每个单词都由小写英文字母组成
    3. 1 <= first.length, second.length <= 10
    4. first 和 second 由小写英文字母组成

    4ms
     1 class Solution {
     2     func findOcurrences(_ text: String, _ first: String, _ second: String) -> [String] {
     3       let subString = first + " " + second
     4       let arr = text.split(separator: " ")
     5       var result = [String]()
     6       for i in 0..<arr.count-2 {
     7         if arr[i] == first && arr[i+1] == second {
     8           result.append(String(arr[i+2]))
     9         }
    10       }
    11       return result
    12     }
    13 }

    Runtime: 8 ms

    Memory Usage: 21.7 MB
     1 import Foundation
     2 class Solution {
     3     func findOcurrences(_ text: String, _ first: String, _ second: String) -> [String] {
     4         if text.isEmpty {return []}
     5         var words:[String] = text.components(separatedBy: " ")
     6         var list:[String] = [String]()
     7         for i in 2..<words.count
     8         {
     9             if first == words[i-2] && second == words[i-1]
    10             {
    11                 list.append(words[i])
    12             }
    13         }
    14         return list
    15     }
    16 }

    8ms

     1 class Solution {
     2     func findOcurrences(_ text: String, _ first: String, _ second: String) -> [String] {
     3         var answer: [String] = []
     4         
     5         var words = Array(text.split(separator: " "))
     6         
     7         var i = 0
     8                 
     9         while (i + 2) < words.count {
    10             if words[i] == first, words[i + 1] == second {
    11                 answer.append(String(words[i + 2]))
    12             }
    13             
    14             i += 1
    15         }
    16 
    17         return answer
    18     }
    19 }
  • 相关阅读:
    python之函数嵌套与闭包
    python之高阶函数
    python之装饰器
    python之内置函数
    python之内置函数:map ,filter ,reduce总结
    Python之reduce函数
    install python2 python3 in same computer
    git basic
    git LF CRLF
    2 thread, first to open chat window, second to make the phone
  • 原文地址:https://www.cnblogs.com/strengthen/p/10993147.html
Copyright © 2011-2022 走看看