Day 6, puzzle 2
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@ -2,7 +2,7 @@ use aoc22::{day6, util};
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pub fn main() {
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let input = util::parse_input();
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let start = day6::parse_datastream(input.as_str());
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let start = day6::parse_datastream(input.as_str(), 4);
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println!("Datastream starts after {} characters", start + 1);
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println!("Packet starts after {} characters", start + 1);
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}
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8
src/bin/d6p2.rs
Normal file
8
src/bin/d6p2.rs
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@ -0,0 +1,8 @@
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use aoc22::{day6, util};
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pub fn main() {
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let input = util::parse_input();
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let start = day6::parse_datastream(input.as_str(), 14);
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println!("Message starts after {} characters", start + 1);
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}
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@ -1,15 +1,15 @@
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use std::collections::{HashSet, VecDeque};
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pub fn parse_datastream(stream: &str) -> usize {
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pub fn parse_datastream(stream: &str, n_distinct: usize) -> usize {
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let mut chars: VecDeque<char> = VecDeque::new();
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for (i, char) in stream.chars().enumerate() {
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if i >= 4 {
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if i >= n_distinct {
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chars.pop_front();
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}
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chars.push_back(char);
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if i >= 3 {
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if i >= n_distinct - 1 {
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let char_set: HashSet<char> = chars.iter().map(char::clone).collect();
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if char_set.len() == 4 {
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if char_set.len() == n_distinct {
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return i;
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}
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}
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