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93 lines
1.7 KiB
Markdown
93 lines
1.7 KiB
Markdown
---
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id: 69bc6cb30c1d112a2e110a09
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title: "Challenge 252: Unique Stair Climber"
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challengeType: 29
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dashedName: challenge-252
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---
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# --description--
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Given a number of stairs, return how many distinct ways someone can climb them taking either 1 or 2 steps at a time.
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# --hints--
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`get_unique_climbs(4)` 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(get_unique_climbs(4), 5)`)
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}})
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```
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`get_unique_climbs(5)` should return `8`.
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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_unique_climbs(5), 8)`)
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}})
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```
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`get_unique_climbs(10)` should return `89`.
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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_unique_climbs(10), 89)`)
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}})
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```
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`get_unique_climbs(18)` should return `4181`.
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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_unique_climbs(18), 4181)`)
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}})
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```
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`get_unique_climbs(29)` should return `832040`.
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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_unique_climbs(29), 832040)`)
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}})
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```
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`get_unique_climbs(50)` should return `20365011074`.
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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_unique_climbs(50), 20365011074)`)
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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_unique_climbs(steps):
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return steps
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```
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# --solutions--
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```py
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def get_unique_climbs(steps):
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if steps <= 0:
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return 0
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if steps == 1:
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return 1
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if steps == 2:
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return 2
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prev2, prev1 = 1, 2
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for _ in range(3, steps + 1):
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prev2, prev1 = prev1, prev2 + prev1
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return prev1
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```
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