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140 lines
3.2 KiB
Markdown
140 lines
3.2 KiB
Markdown
---
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id: 699c8e045ee7cb94ed2322dd
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title: "Challenge 222: Equinox Shadows"
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challengeType: 29
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dashedName: challenge-222
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---
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# --description--
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Today is the equinox, when the sun is directly above the equator and perfectly overhead at noon. Given a time, determine the shadow cast by a 4-foot vertical pole.
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- The time will be a string in `"HH:MM"` 24-hour format (for example, `"15:00"` is 3pm).
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- You will only be given a time in 30 minute increments.
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Rules:
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- The sun rises at 6am directly `"east"`, and sets at 6pm directly `"west"`.
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- A shadow always points opposite the sun.
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- The shadow's length (in feet) is the number of hours away from noon, cubed.
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- There is no shadow before sunrise (before 6am), after sunset (6pm or later), or at noon.
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Return:
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- If a shadow exists, return `"(length)ft (direction)"`. For example, `"8ft west"`.
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- Otherwise, return `"No shadow"`.
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For example, given `"10:00"`, return `"8ft west"` because 10am is 2 hours from noon, so 2<sup>3</sup> = 8 feet, and the shadow points west because the sun is in the east at 10am.
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# --hints--
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`get_shadow("10:00")` should return `"8ft west"`.
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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(get_shadow("10:00"), "8ft west")`)
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}})
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```
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`get_shadow("15:00")` should return `"27ft east"`.
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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(get_shadow("15:00"), "27ft east")`)
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}})
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```
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`get_shadow("12:00")` should return `"No shadow"`.
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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(get_shadow("12:00"), "No shadow")`)
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}})
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```
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`get_shadow("17:30")` should return `"166.375ft east"`.
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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(get_shadow("17:30"), "166.375ft east")`)
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}})
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```
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`get_shadow("05:00")` should return `"No shadow"`.
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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(get_shadow("05:00"), "No shadow")`)
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}})
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```
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`get_shadow("06:00")` should return `"216ft west"`.
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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(get_shadow("06:00"), "216ft west")`)
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}})
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```
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`get_shadow("18:00")` should return `"No shadow"`.
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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(get_shadow("18:00"), "No shadow")`)
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}})
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```
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`get_shadow("07:30")` should return `"91.125ft west"`.
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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(get_shadow("07:30"), "91.125ft west")`)
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}})
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```
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`get_shadow("00:00")` should return `"No shadow"`.
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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(get_shadow("00:00"), "No shadow")`)
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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 get_shadow(time):
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return time
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```
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# --solutions--
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```py
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def get_shadow(time):
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hour_str, minute_str = time.split(":")
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hours = int(hour_str)
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minutes = int(minute_str)
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time_in_hours = hours + minutes / 60
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if time_in_hours < 6 or time_in_hours >= 18 or time_in_hours == 12:
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return "No shadow"
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hours_from_noon = abs(12 - time_in_hours)
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length = hours_from_noon ** 3
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direction = "west" if time_in_hours < 12 else "east"
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return f"{length:g}ft {direction}"
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```
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