diff --git a/src/bin/day18.rs b/src/bin/day18.rs
index a71fbb3..7f15256 100644
--- a/src/bin/day18.rs
+++ b/src/bin/day18.rs
@@ -46,7 +46,12 @@ impl Day18 {
     where
         T: Iterator<Item = (i64, (i64, i64))>
     {
-        let mut points = vec![(0, 0)];
+        let (low, high) = data.size_hint();
+        let mut points = Vec::with_capacity(
+            high.unwrap_or(low) + 1
+        );
+        points.push((0, 0));
+
         let mut perimeter = 0;
 
         for (dist, (dir_x, dir_y)) in data {
diff --git a/src/bin/day19.rs b/src/bin/day19.rs
index 900a99b..1da23e5 100644
--- a/src/bin/day19.rs
+++ b/src/bin/day19.rs
@@ -80,8 +80,7 @@ impl Day19 {
                     .unwrap();
                 let mut data = data
                     .trim_end_matches('}')
-                    .split(',')
-                    .rev();
+                    .rsplit(',');
                 let default = data
                     .next()
                     .unwrap();