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29 lines
650 B
29 lines
650 B
7 years ago
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use failure::*;
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pub fn solve(_: &str) -> Result<String, Error> {
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let a = Generator{value: 679, factor: 16807};
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let b = Generator{value: 771, factor: 48271};
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let answer = a.filter(|a| a % 4 == 0).zip(b.filter(|b| b % 8 == 0))
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.take(5_000_000)
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.filter(|&(a,b)| a & 0b1111111111111111 == b & 0b1111111111111111)
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.count();
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Ok(answer.to_string())
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}
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struct Generator {
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value: usize,
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factor: usize,
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}
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impl Iterator for Generator {
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type Item = usize;
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fn next(&mut self) -> Option<Self::Item> {
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self.value *= self.factor;
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self.value %= 2147483647;
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Some(self.value)
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}
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}
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