91 lines
2.2 KiB
Rust
91 lines
2.2 KiB
Rust
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use crate::common::AdventOfCodeDay;
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use std::collections::HashSet;
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pub struct Day09 {
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input: Vec<u64>,
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}
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impl Day09 {
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pub fn new() -> Self {
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let input_bytes = include_bytes!("../res/09_input.txt");
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let input_str = String::from_utf8_lossy(input_bytes);
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let data = input_str
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.lines()
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.map(|p| p.parse::<u64>().unwrap())
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.collect::<Vec<u64>>();
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Self {
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input: data
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}
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}
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fn all_combinations(data: Vec<&u64>) -> HashSet<u64> {
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let mut hs: HashSet<u64> = HashSet::new();
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for i1 in 0..24 {
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for i2 in (i1+1)..25 {
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hs.insert(data[i1] + data[i2]);
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}
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}
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return hs;
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}
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fn find_invalid(&self) -> u64 {
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for i in 25..self.input.len() {
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let comb = Day09::all_combinations(self.input.iter().skip(i-25).take(25).collect());
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if !comb.contains(&self.input[i]) {
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return self.input[i];
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}
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}
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panic!();
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}
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}
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impl AdventOfCodeDay for Day09 {
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fn task_1(&self) -> String {
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return self.find_invalid().to_string();
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}
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fn task_2(&self) -> String {
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let target = self.find_invalid();
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let mut sum = self.input[0];
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let mut idx1 = 0; //inclusive
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let mut idx2 = 0; //inclusive
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loop {
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if sum == target {
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verboseln!("[{}..{}] [[{:?}]] = {} ({})",
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idx1,
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idx2,
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self.input.iter().skip(idx1).take(idx2-idx1+1).collect::<Vec<&u64>>(),
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self.input.iter().skip(idx1).take(idx2-idx1+1).sum::<u64>(),
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target);
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return (self.input.iter().skip(idx1).take(idx2-idx1+1).min().unwrap() + self.input.iter().skip(idx1).take(idx2-idx1+1).max().unwrap()).to_string();
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} else if sum < target {
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idx2 += 1;
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sum += self.input[idx2];
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} else if sum > target {
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sum -= self.input[idx1];
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idx1 += 1;
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}
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verboseln!("[{}..{}] = {}", idx1, idx2, sum);
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}
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}
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}
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