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@ -15,20 +15,23 @@ fn test_day_1_0() {
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}
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}
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fn day_1_1(input: &str, delimiter: &str) -> String {
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fn day_1_1(input: &str, delimiter: &str) -> String {
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let mut seen = HashMap::new();
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vec![0 as i32] // Start with 0 frequency
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seen.insert(0, 1);
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.into_iter()
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.chain(
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input
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input
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.split(delimiter)
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.split(delimiter)
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.flat_map(|change| change.parse::<i32>().ok())
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.map(|change| change.parse::<i32>().unwrap())
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.cycle()
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.cycle(),
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.scan((seen, 0), |(seen, freq), change| {
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)
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.scan(0, |freq, change| {
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*freq += change;
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*freq += change;
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Some(*freq)
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let count = seen.entry(freq.clone()).or_insert(0);
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})
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.scan(HashMap::new(), |history, freq| {
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let count = history.entry(freq).or_insert(0);
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*count += 1;
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*count += 1;
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Some((*freq, *count))
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Some((freq, *count))
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})
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})
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.filter(|(_, count)| *count > 1)
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.filter(|(_, count)| *count > 1)
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.map(|(freq, _)| freq)
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.map(|(freq, _)| freq)
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