day 1 done

01/main.rs

@@ -22,10 +22,55 @@ fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
 where
     P: AsRef<Path>,
 {
+    // note that this discards a final newline
     let file = File::open(filename)?;
     Ok(io::BufReader::new(file).lines())
 }
 
-fn part_one() {}
+fn part_one() {
+    if let Ok(lines) = read_lines("./inputs/input") {
+        let mut biggest = 0;
+        let mut accumulator = 0;
+        for line in lines {
+            if let Ok(calories) = line {
+                if calories != "" {
+                    accumulator += calories.parse::<u32>().unwrap();
+                } else {
+                    if accumulator > biggest {
+                        biggest = accumulator
+                    }
+                    accumulator = 0;
+                }
+            }
+        }
+        // catching final elf
+        if accumulator > biggest {
+            biggest = accumulator
+        }
+        println!("{}", biggest);
+    }
+}
 
-fn part_two() {}
+fn part_two() {
+    if let Ok(lines) = read_lines("./inputs/input") {
+        let mut elves = Vec::new();
+        let mut accumulator = 0;
+        for line in lines {
+            if let Ok(calories) = line {
+                if calories != "" {
+                    accumulator += calories.parse::<u32>().unwrap();
+                } else {
+                    elves.push(accumulator);
+                    accumulator = 0;
+                }
+            }
+        }
+        // catching final elf
+        elves.push(accumulator);
+        elves.sort_unstable();
+        println!(
+            "{}",
+            elves.pop().unwrap() + elves.pop().unwrap() + elves.pop().unwrap()
+        );
+    }
+}

main.rs.tmpl

@@ -22,6 +22,7 @@ fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
 where
     P: AsRef<Path>,
 {
+    // note that this discards a final newline
     let file = File::open(filename)?;
     Ok(io::BufReader::new(file).lines())
 }