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pub fn solve(input: &str) -> String {
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let parsed = input.lines()
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.map(|line| {
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line.split_whitespace().map(str::parse).collect::<Result<Vec<usize>, _>>()
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})
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.collect::<Result<Vec<_>, _>>()
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.expect("couldn't parse input");
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let count = parsed.chunks(3)
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.flat_map(|chunk| {
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vec![
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Triangle(chunk[0][0], chunk[1][0], chunk[2][0]),
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Triangle(chunk[0][1], chunk[1][1], chunk[2][1]),
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Triangle(chunk[0][2], chunk[1][2], chunk[2][2]),
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]
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})
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.filter(Triangle::is_valid)
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.count();
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count.to_string()
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}
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struct Triangle(usize, usize, usize);
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impl Triangle {
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fn is_valid(&self) -> bool {
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self.0 + self.1 > self.2 && self.0 + self.2 > self.1 &&
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self.1 + self.2 > self.0
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}
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}
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#[test]
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fn test_triangle() {
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assert!(!Triangle(5, 10, 25).is_valid());
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}
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