FastPrepSpam Text Classification
Problem

Spam Text Classification

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Problem statement

A classification system evaluates whether each text is spam using a list of spam words.

A text is labeled "spam" if it contains at least two spam-word occurrences. Each occurrence of a spam word counts toward the total, and matching is case-sensitive.

Given an array texts and an array spamWords, return an array where each element is either "spam" or "not_spam" for the corresponding text.

Function

classifyTexts(texts: String[], spamWords: String[]) → String[]

Examples

Example 1

texts = ["This is a limited offer just for you","Win cash now! Click here to claim your prize","Hello friend, just checking in","Congratulations! You have won a free gift"]spamWords = ["offer","cash","Click","prize","Congratulations","free"]return = ["not_spam","spam","not_spam","spam"]

The first and third texts contain fewer than two spam-word occurrences. The second and fourth texts contain at least two.

Constraints

  • 1 <= texts.length <= 10^3
  • 1 <= spamWords.length <= 10^5
  • 1 <= text.length <= 10^5
  • 1 <= spamWord.length <= 10^5
  • The combined length of all spam words is at most 10^7.

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public String[] classifyTexts(String[] texts, String[] spamWords) {
  // write your code here
}
texts["This is a limited offer just for you","Win cash now! Click here to claim your prize","Hello friend, just checking in","Congratulations! You have won a free gift"]
spamWords["offer","cash","Click","prize","Congratulations","free"]
expected["not_spam", "spam", "not_spam", "spam"]
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