init

problems/p13/src/main.rs

@@ -0,0 +1,25 @@
+use std::{
+    fs::File,
+    io::{BufRead, BufReader},
+    str::FromStr,
+};
+
+use anyhow::Result;
+use num_bigint::BigUint;
+
+fn main() -> Result<()> {
+    let file = File::open("p13/input.txt")?;
+    let reader = BufReader::new(file);
+    let mut numbers: Vec<BigUint> = Vec::new();
+    for line in reader.lines() {
+        let line = line?;
+        let trimmed = line.trim();
+        if !trimmed.is_empty() {
+            let big_num = BigUint::from_str(trimmed).unwrap();
+            numbers.push(big_num);
+        }
+    }
+    let result: BigUint = numbers.iter().sum();
+    println!("{result}");
+    Ok(())
+}