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96 lines
2.4 KiB
Markdown
96 lines
2.4 KiB
Markdown
---
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id: 68c1a929005bf54d342aa8d3
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title: "Challenge 56: Space Week Day 2: Exoplanet Search"
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challengeType: 29
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dashedName: challenge-56
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---
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# --description--
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For the second day of Space Week, you are given a string where each character represents the luminosity reading of a star. Determine if the readings have detected an exoplanet using the transit method. The transit method is when a planet passes in front of a star, reducing its observed luminosity.
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- Luminosity readings only comprise of characters `0-9` and `A-Z` where each reading corresponds to the following numerical values:
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- Characters `0-9` correspond to luminosity levels `0-9`.
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- Characters `A-Z` correspond to luminosity levels `10-35`.
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A star is considered to have an exoplanet if any single reading is less than or equal to 80% of the average of all readings. For example, if the average luminosity of a star is 10, it would be considered to have a exoplanet if any single reading is 8 or less.
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# --hints--
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`has_exoplanet("665544554")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(has_exoplanet("665544554"), False)`)
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}})
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```
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`has_exoplanet("FGFFCFFGG")` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(has_exoplanet("FGFFCFFGG"), True)`)
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}})
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```
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`has_exoplanet("MONOPLONOMONPLNOMPNOMP")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(has_exoplanet("MONOPLONOMONPLNOMPNOMP"), False)`)
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}})
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```
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`has_exoplanet("FREECODECAMP")` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(has_exoplanet("FREECODECAMP"), True)`)
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}})
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```
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`has_exoplanet("9AB98AB9BC98A")` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(has_exoplanet("9AB98AB9BC98A"), False)`)
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}})
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```
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`has_exoplanet("ZXXWYZXYWYXZEGZXWYZXYGEE")` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(has_exoplanet("ZXXWYZXYWYXZEGZXWYZXYGEE"), True)`)
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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 has_exoplanet(readings):
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return readings
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```
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# --solutions--
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```py
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def has_exoplanet(readings):
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values = [int(c, 36) for c in readings]
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average = sum(values) / len(values)
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threshold = average * 0.8
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for v in values:
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if v <= threshold:
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return True
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return False
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```
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