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98 lines
2.3 KiB
Markdown
98 lines
2.3 KiB
Markdown
---
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id: 69bc6cb30c1d112a2e110a06
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title: "Challenge 249: String Math"
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challengeType: 29
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dashedName: challenge-249
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---
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# --description--
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Given a string with numbers and other characters, perform math on the numbers based on the count of non-digit characters between the numbers.
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- If the count of characters separating two numbers is even, use addition.
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- If it's odd, use subtraction.
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- Consecutive digits form a single number.
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- Operations are applied left to right.
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- Ignore leading and trailing characters that aren't digits.
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For example, given `"3ab10c8"`, return `5`. Add 3 and 10 to get 13 because there's an even number of characters between them. Then subtract 8 from 13 because there's an odd number of characters between the result and 8.
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# --hints--
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`do_math("3ab10c8")` 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(do_math("3ab10c8"), 5)`)
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}})
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```
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`do_math("6MINUS4")` should return `2`.
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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(do_math("6MINUS4"), 2)`)
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}})
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```
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`do_math("9plus3")` should return `12`.
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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(do_math("9plus3"), 12)`)
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}})
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```
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`do_math("5fkwo#10i#%.<>15P=@20!#B/25")` should return `15`.
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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(do_math("5fkwo#10i#%.<>15P=@20!#B/25"), 15)`)
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}})
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```
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`do_math("a.67,1$lk6ldf34@#LD@]2d32d2'2l3,@l3L#@2gh35s09if=df#$t9sm49t0df3$^%[vc;:0:4mt")` should return `67`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(do_math("a.67,1$lk6ldf34@#LD@]2d32d2'2l3,@l3L#@2gh35s09if=df#$t9sm49t0df3$^%[vc;:0:4mt"), 67)`)
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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 do_math(s):
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return s
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```
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# --solutions--
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```py
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import re
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def do_math(s):
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tokens = re.findall(r'\d+|\D+', s)
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result = None
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pending_op = None
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for token in tokens:
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if re.match(r'^\d+$', token):
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if result is None:
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result = int(token)
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elif pending_op == 'add':
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result += int(token)
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else:
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result -= int(token)
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else:
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pending_op = 'add' if len(token) % 2 == 0 else 'subtract'
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return result
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```
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