basic graph and input data

input.csv

@@ -0,0 +1,2 @@
+origin_airport_code,origin_airport,origin_airport_id,origin_airport_latitude,origin_airport_longitude,origin_city,origin_country,destination_airport_code,destination_airport,destination_airport_id,destination_airport_latitude,destination_airport_longitude,destination_city,destination_country
+PDX,Portland International Airport,3720,45.58869934,-122.5979996,Portland,United States,SFO,San Francisco International Airport,3469,37.61899948120117,-122.375,San Francisco,United States

src/main.rs

@@ -1,15 +1,39 @@
 mod distance;
 mod parse;
 
+use std::collections::HashMap;
+
 use parse::Record;
 
+#[derive(Debug)]
+struct Node {
+    destinations: Vec<Record>,
+}
+
 fn main() {
     // Read all data lines in, ignoring errors
-    let _data: Vec<Record> = csv::Reader::from_reader(std::io::stdin())
+    let data: Vec<Record> = csv::Reader::from_reader(std::io::stdin())
         .deserialize()
         .flatten()
         .collect();
 
+    let mut graph: HashMap<String, Node> = HashMap::new();
+
+    for record in data.into_iter() {
+        use std::collections::hash_map::Entry;
+
+        match graph.entry(record.origin_airport_code.clone()) {
+            Entry::Occupied(mut entry) => entry.get_mut().destinations.push(record),
+            Entry::Vacant(entry) => {
+                entry.insert(Node {
+                    destinations: vec![record],
+                });
+            }
+        }
+    }
+
+    println!("{graph:#?}");
+
     println!(
         "{}",
         distance::haversine((19.10317, -165.54224), (73.85371, 55.85692))

src/parse.rs

@@ -2,16 +2,16 @@
 pub struct Record {
     pub origin_airport_code: String,
     pub origin_airport: String,
-    pub origin_airport_id: String,
-    pub origin_airport_latitude: String,
-    pub origin_airport_longitude: String,
+    pub origin_airport_id: usize,
+    pub origin_airport_latitude: f64,
+    pub origin_airport_longitude: f64,
     pub origin_city: String,
     pub origin_country: String,
     pub destination_airport_code: String,
     pub destination_airport: String,
-    pub destination_airport_id: String,
-    pub destination_airport_latitude: String,
-    pub destination_airport_longitude: String,
+    pub destination_airport_id: usize,
+    pub destination_airport_latitude: f64,
+    pub destination_airport_longitude: f64,
     pub destination_city: String,
     pub destination_country: String,
 }