Day 1

src/bin/01_1.rs

@@ -0,0 +1,30 @@
+#![feature(slice_group_by)]
+
+use itertools::Itertools;
+use itertools::max;
+use std::fs;
+use anyhow::Result;
+
+
+fn main() -> Result<()> {
+    let input = fs::read_to_string("input/01.txt")?;
+
+    let groups = input
+        .split("\n").collect::<Vec<&str>>()
+        .into_iter()
+        .group_by(|ell| *ell != "");
+
+    let elves = groups
+        .into_iter()
+        .filter(|(key, _)| *key)
+        .map(|(_, elf)| elf
+            .into_iter()
+            .map(|val| val.parse::<i32>().unwrap())
+            .fold(0, |acc, val| acc + val)
+        );
+
+    let highest = max(elves);
+    println!("{:?}", highest);
+
+    return Ok(());
+}

src/bin/01_2.rs

@@ -0,0 +1,35 @@
+#![feature(slice_group_by)]
+
+use itertools::Itertools;
+use itertools::sorted;
+use std::fs;
+use anyhow::Result;
+
+
+fn main() -> Result<()> {
+    let input = fs::read_to_string("input/01.txt")?;
+
+    let groups = input
+        .split("\n").collect::<Vec<&str>>()
+        .into_iter()
+        .group_by(|ell| *ell != "");
+
+    let elves: Vec<i32> = groups
+        .into_iter()
+        .filter(|(key, _)| *key)
+        .map(|(_, elf)| elf
+            .into_iter()
+            .map(|val| val.parse::<i32>().unwrap())
+            .sum()
+        ).collect();
+
+    let highest = sorted(elves);
+    let sum: i32 = highest
+        .into_iter()
+        .rev()
+        .take(3)
+        .sum();
+    println!("{:?}", sum);
+
+    return Ok(());
+}