Add day7

1 files changed, 29 insertions, 0 deletions

diff --git a/day7/src/main.rs b/day7/src/main.rs
new file mode 100644
index 0000000..26e1e30
--- /dev/null
+++ b/day7/src/main.rs
@@ -0,0 +1,29 @@
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+
+fn main() -> std::io::Result<()> {
+    let file = File::open("input.txt")?;
+    let mut reader = BufReader::new(file);
+    let mut buffer = String::new();
+    reader.read_line(&mut buffer)?;
+
+    let mut inputs: Vec<_> = buffer
+        .trim()
+        .split(',')
+        .map(|x| x.parse::<i16>().unwrap())
+        .collect::<Vec<i16>>();
+
+    inputs.sort();
+
+    let half: usize = inputs.len() / 2;
+    let middle = inputs[half];
+    let mut sum: u32 = 0;
+
+    for input in inputs {
+        sum += (input - middle).abs() as u32;
+    }
+
+    println!("{}", sum);
+
+    Ok(())
+}