2018: aoc02 part1
This commit is contained in:
parent
bcf61577e1
commit
b80637585b
9
2018/aoc02/Cargo.toml
Normal file
9
2018/aoc02/Cargo.toml
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[package]
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name = "aoc02"
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version = "0.1.0"
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authors = ["Antoine Martin <antoine97.martin@gmail.com>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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250
2018/aoc02/input/input.txt
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250
2018/aoc02/input/input.txt
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44
2018/aoc02/src/main.rs
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2018/aoc02/src/main.rs
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use std::collections::HashMap;
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use std::env;
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use std::fs;
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type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
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fn main() -> Result<()> {
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let mut args = env::args();
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args.next();
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let input = fs::read_to_string(
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&args
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.next()
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.expect("Please provide the path to the input file"),
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)?;
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part1(&input)?;
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Ok(())
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}
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fn part1(input: &str) -> Result<()> {
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let mut twice = 0;
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let mut thrice = 0;
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for line in input.lines() {
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let mut seen: HashMap<char, u32> = HashMap::new();
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for c in line.chars() {
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*seen.entry(c).or_default() += 1;
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}
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if seen.values().any(|x| *x == 2) {
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twice += 1;
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}
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if seen.values().any(|x| *x == 3) {
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thrice += 1;
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}
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}
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println!("{}", twice * thrice);
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Ok(())
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}
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4
Cargo.lock
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4
Cargo.lock
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name = "aoc01"
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version = "0.1.0"
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[[package]]
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name = "aoc02"
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version = "0.1.0"
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[workspace]
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members = [
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"2018/aoc01",
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"2018/aoc02",
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]
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