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22 lines
483 B
22 lines
483 B
7 years ago
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use failure::*;
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pub fn solve(input: &str) -> Result<String, Error> {
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let mut input: Vec<u32> = input
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.trim()
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.chars()
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.map(|x| x.to_digit(10).ok_or_else(|| format_err!("")))
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.collect::<Result<_, _>>()?;
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// 1
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let last = input[input.len() - 1];
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input.push(last);
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Ok(
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input
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.windows(2)
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.filter(|&a| a[0] == a[1])
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.map(|a| a[0])
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.sum::<u32>()
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.to_string(),
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)
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}
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