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@ -1,6 +1,7 @@
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use std::collections::HashMap;
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use std::io::{self, Read};
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use std::io::{self, Read};
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fn day_1(input: &str, delimiter: &str) -> String {
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fn day_1_0(input: &str, delimiter: &str) -> String {
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let sum: i32 = input
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let sum: i32 = 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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.flat_map(|change| change.parse::<i32>().ok())
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@ -9,14 +10,46 @@ fn day_1(input: &str, delimiter: &str) -> String {
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}
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}
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#[test]
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#[test]
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fn test_day_1() {
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fn test_day_1_0() {
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assert_eq!(day_1("+1, -2, +3, +1", ", "), "3");
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assert_eq!(day_1_0("+1, -2, +3, +1", ", "), "3");
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}
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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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seen.insert(0, 1);
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input
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.split(delimiter)
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.flat_map(|change| change.parse::<i32>().ok())
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.cycle()
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.scan((seen, 0), |(seen, freq), change| {
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*freq += change;
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let count = seen.entry(freq.clone()).or_insert(0);
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*count += 1;
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Some((freq.clone(), count.clone()))
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})
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.filter(|(_, count)| *count > 1)
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.map(|(freq, _)| freq)
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.next()
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.unwrap()
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.to_string()
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}
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#[test]
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fn test_day_1_1() {
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assert_eq!(day_1_1("+1, -2, +3, +1", ", "), "2");
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assert_eq!(day_1_1("+1, -1", ", "), "0");
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assert_eq!(day_1_1("+3, +3, +4, -2, -4", ", "), "10");
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assert_eq!(day_1_1("-6, +3, +8, +5, -6", ", "), "5");
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assert_eq!(day_1_1("+7, +7, -2, -7, -4", ", "), "14");
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}
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}
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fn main() {
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fn main() {
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let mut input = String::new();
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let mut input = String::new();
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io::stdin().read_to_string(&mut input).unwrap();
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io::stdin().read_to_string(&mut input).unwrap();
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let output = day_1(&input, "\n");
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let output = day_1_1(&input, "\n");
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println!("{}", output);
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println!("{}", output);
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}
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}
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