From d18716495424864397398f8adb160dbb07b31cd3 Mon Sep 17 00:00:00 2001
From: David Ashby <delta.mu.alpha@gmail.com>
Date: Wed, 3 Dec 2025 22:25:13 -0500
Subject: [PATCH] add timings

---
 main.java.tmpl |  7 +++++++
 src/Day01.java |  7 +++++++
 src/Day02.java |  7 +++++++
 src/Day03.java | 13 +++++++++----
 4 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/main.java.tmpl b/main.java.tmpl
index 653b778..9d81eca 100644
--- a/main.java.tmpl
+++ b/main.java.tmpl
@@ -1,12 +1,19 @@
 package src;
 
 import java.io.FileReader;
+import java.time.Duration;
+import java.time.Instant;
 import java.util.Scanner;
 
 public class Day00 {
     public static void main(String[] args) {
+        Instant start = Instant.now();
         part1();
+        Instant middle = Instant.now();
         part2();
+        Instant end = Instant.now();
+        IO.println("part 1: " + Duration.between(start, middle).toMillis() + " ms");
+        IO.println("part 2: " + Duration.between(middle, end).toMillis() + " ms");
     }
 
     private static void part1() {
diff --git a/src/Day01.java b/src/Day01.java
index bd7f8ff..69d78ec 100644
--- a/src/Day01.java
+++ b/src/Day01.java
@@ -1,12 +1,19 @@
 package src;
 
 import java.io.FileReader;
+import java.time.Duration;
+import java.time.Instant;
 import java.util.Scanner;
 
 public class Day01 {
     public static void main(String[] args) {
+        Instant start = Instant.now();
         part1();
+        Instant middle = Instant.now();
         part2();
+        Instant end = Instant.now();
+        IO.println("part 1: " + Duration.between(start, middle).toMillis() + " ms");
+        IO.println("part 2: " + Duration.between(middle, end).toMillis() + " ms");
     }
 
     private static void part1() {
diff --git a/src/Day02.java b/src/Day02.java
index 35d666c..bc1b33c 100644
--- a/src/Day02.java
+++ b/src/Day02.java
@@ -1,12 +1,19 @@
 package src;
 
 import java.io.FileReader;
+import java.time.Duration;
+import java.time.Instant;
 import java.util.Scanner;
 
 public class Day02 {
     public static void main(String[] args) {
+        Instant start = Instant.now();
         part1();
+        Instant middle = Instant.now();
         part2();
+        Instant end = Instant.now();
+        IO.println("part 1: " + Duration.between(start, middle).toMillis() + " ms");
+        IO.println("part 2: " + Duration.between(middle, end).toMillis() + " ms");
     }
 
     private static void part1() {
diff --git a/src/Day03.java b/src/Day03.java
index e9fdec8..0a401d8 100644
--- a/src/Day03.java
+++ b/src/Day03.java
@@ -1,14 +1,21 @@
 package src;
 
 import java.io.FileReader;
+import java.time.Duration;
+import java.time.Instant;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
 
 public class Day03 {
     public static void main(String[] args) {
+        Instant start = Instant.now();
         part1();
+        Instant middle = Instant.now();
         part2();
+        Instant end = Instant.now();
+        IO.println("part 1: " + Duration.between(start, middle).toMillis() + " ms");
+        IO.println("part 2: " + Duration.between(middle, end).toMillis() + " ms");
     }
 
     private static void part1() {
@@ -48,8 +55,7 @@ public class Day03 {
                 String raw = scanner.nextLine();
                 List<String> bank = List.of(raw.split(""));
                 // first, get the initial 12 batteries
-                List<String> curr = new ArrayList<>();
-                curr.addAll(bank.subList(0, 12));
+                List<String> curr = new ArrayList<>(bank.subList(0, 12));
                 for (int i = 12; i < bank.size(); i++) {
                     curr.add(bank.get(i)); // add the next battery to the end of the list
                     // find the smallest battery in the list that's ahead of a larger battery
@@ -61,8 +67,7 @@ public class Day03 {
                     }
                     curr.remove(t1);
                 }
-                String result = curr.stream().reduce("", String::concat);
-                sum += Long.parseLong(result);
+                sum += Long.parseLong(String.join("", curr));
             }
             IO.println(sum);
         } catch (Exception e) {