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96 lines
2.2 KiB
Markdown
96 lines
2.2 KiB
Markdown
---
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id: 691f7773cddba1caf1bf5ece
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title: "Challenge 135: Re: Fwd: Fw: Count"
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challengeType: 29
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dashedName: challenge-135
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---
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# --description--
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Given a string representing the subject line of an email, determine how many times the email has been forwarded or replied to.
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For simplicity, consider an email forwarded or replied to if the string contains any of the following markers (case-insensitive):
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- `"fw:"`
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- `"fwd:"`
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- `"re:"`
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Return the total number of occurrences of these markers.
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# --hints--
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`email_chain_count("Re: Meeting Notes")` should return `1`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(email_chain_count("Re: Meeting Notes"), 1)`)
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}})
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```
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`email_chain_count("Meeting Notes")` should return `0`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(email_chain_count("Meeting Notes"), 0)`)
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}})
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```
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`email_chain_count("Re: re: RE: rE: Meeting Notes")` should return `4`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(email_chain_count("Re: re: RE: rE: Meeting Notes"), 4)`)
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}})
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```
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`email_chain_count("Re: Fwd: Re: Fw: Re: Meeting Notes")` should return `5`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(email_chain_count("Re: Fwd: Re: Fw: Re: Meeting Notes"), 5)`)
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}})
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```
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`email_chain_count("re:Ref:fw:re:review:FW:Re:fw:report:Re:FW:followup:re:summary:Fwd:Re:fw:NextStep:RE:FW:re:Project:Fwd:Re:fw:Notes:RE:re:Update:FWD:Re:fw:Summary")` should return `23`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(email_chain_count("re:Ref:fw:re:review:FW:Re:fw:report:Re:FW:followup:re:summary:Fwd:Re:fw:NextStep:RE:FW:re:Project:Fwd:Re:fw:Notes:RE:re:Update:FWD:Re:fw:Summary"), 23)`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def email_chain_count(subject):
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return subject
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```
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# --solutions--
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```py
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def email_chain_count(subject):
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markers = ["re:", "fwd:", "fw:"]
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lower = subject.lower()
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count = 0
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for marker in markers:
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start = 0
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while True:
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idx = lower.find(marker, start)
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if idx == -1:
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break
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count += 1
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start = idx + len(marker)
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return count
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```
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