basic version

.gitignore

@@ -1,3 +1,4 @@
 /target
 measurements.txt
 flamegraph.svg
+perf.data

Cargo.toml

@@ -2,6 +2,7 @@
 name = "brc"
 version = "0.1.0"
 edition = "2024"
+default-run = "brc"
 
 [dependencies]
 rand_distr = "*"

src/main.rs

@@ -1,3 +1,44 @@
+use std::{collections::HashMap, io::BufRead};
+
 fn main() {
-    println!("Hello, world!");
+    let file = std::io::BufReader::new(std::fs::File::open("measurements.txt").unwrap());
+
+    let mut data = HashMap::new();
+
+    for result in file.lines() {
+        let line = result.unwrap();
+
+        let (station, value) = line.split_once(';').unwrap();
+        let station = station.to_string();
+
+        let parsed: f64 = value.parse().unwrap();
+        data.entry(station)
+            .and_modify(|values: &mut (f64, f64, usize, f64)| {
+                values.0 = values.0.min(parsed);
+                values.1 += parsed;
+                values.2 += 1;
+                values.3 = values.3.max(parsed);
+            })
+            .or_insert((parsed, parsed, 1_usize, parsed));
+    }
+
+    let mut stations: Vec<_> = data.keys().collect();
+    stations.sort();
+
+    print!("{{");
+
+    let mut iter = stations.into_iter().peekable();
+    while let Some(s) = iter.next() {
+        let entry = data.get(s).unwrap();
+        print!(
+            "{s}={:.1}/{:.1}/{:.1}",
+            entry.0,
+            entry.1 / (entry.2 as f64),
+            entry.3
+        );
+        if iter.peek().is_some() {
+            print!(", ");
+        }
+    }
+    println!("}}");
 }