diff --git a/2025/rust2/src/main.rs b/2025/rust2/src/main.rs new file mode 100644 index 0000000..ed8d2c9 --- /dev/null +++ b/2025/rust2/src/main.rs @@ -0,0 +1,50 @@ +use std::fs::File; +use std::io::{BufRead, BufReader}; + +fn main() { + // let filename = "../2/input_example.txt"; + let filename = "../2/input.txt"; + let file = BufReader::new(File::open(filename).expect("Unable to open file")); + + // let mut ranges: Vec = Vec::new(); + let mut ranges: Vec> = Vec::new(); + let mut bad_id: Vec = Vec::new(); + + for line in file.lines() { + let wline: String = line.unwrap(); + let sranges: Vec<&str> = wline.split(',').collect(); + + for s in sranges { + let range: Vec = s.split('-').map(|x| x.parse().unwrap()).collect(); + // println!("{:?}", range); + for id in range[0]..range[1] + 1 { + let s = id.to_string().into_bytes(); + ranges.push(s); + } + } + } + println!("number of ranges to inspect {:?}", ranges.len()); + // println!("{:?}", ranges); + + for product_id in ranges { + if product_id.len() % 2 == 1 { + continue; + } + let pivot = product_id.len() / 2; + let mut bad: bool = true; + for i in 0..pivot { + if product_id[i] != product_id[pivot + i] { + bad = false; + break; + } + } + if bad { + let num = str::from_utf8(&product_id).unwrap(); + bad_id.push(num.parse().unwrap()) + } + } + // println!("bad ids {:?}", bad_id); + let sum: u64 = bad_id.iter().sum(); + + println!("{}", sum) +}