From 207f0b39b6a045596cd243259c9184884688aa3b Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Sun, 3 Dec 2023 13:14:42 +0000
Subject: Day 02

---
 day02/day02.java | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 day02/day02.java

(limited to 'day02/day02.java')

diff --git a/day02/day02.java b/day02/day02.java
new file mode 100644
index 0000000..85c1c3f
--- /dev/null
+++ b/day02/day02.java
@@ -0,0 +1,113 @@
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.util.ArrayList;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+public class day02 {
+  public static void main(String args[]) throws IOException {
+    RandomAccessFile input = new RandomAccessFile("input", "r");
+    System.out.println("Day 01 Part 1: " + part1(input));
+    input.seek(0);
+    System.out.println("Day 01 Part 2: " + part2(input));
+    input.close();
+  }
+
+  public static String part1(RandomAccessFile input) throws IOException {
+    int tot = 0;
+    String line;
+
+    while ((line = input.readLine()) != null) {
+      tot += gamePossible(line);
+    }
+
+    return Integer.toString(tot);
+  }
+
+  private static int gamePossible(String line) {
+    Pattern idpat = Pattern.compile("Game (\\d+):");
+    Pattern gamepat = Pattern.compile("(\\d+) (red|green|blue)(, (\\d+) (red|green|blue))*(;|\\Z)");
+    Pattern drawpat = Pattern.compile("(\\d+) (red|green|blue)");
+
+    Matcher idmat = idpat.matcher(line);
+    idmat.find();
+    int id = Integer.parseInt(idmat.group(1));
+
+    boolean valid = true;
+
+    Matcher gamemat = gamepat.matcher(line);
+    while (gamemat.find()) {
+      Matcher drawmat = drawpat.matcher(line.substring(gamemat.start(), gamemat.end()));
+      while (drawmat.find()) {
+        int num = Integer.parseInt(drawmat.group(1));
+        switch (drawmat.group(2)) {
+          case "red":
+            if (num > 12) {
+              valid = false;
+            }
+            break;
+          case "green":
+            if (num > 13) {
+              valid = false;
+            }
+            break;
+          case "blue":
+            if (num > 14) {
+              valid = false;
+            }
+        }
+      }
+    }
+
+    return valid ? id : 0;
+  }
+
+  public static String part2(RandomAccessFile input) throws IOException {
+    int tot = 0;
+    String line;
+
+    while ((line = input.readLine()) != null) {
+      tot += gamePower(line);
+    }
+
+    return Integer.toString(tot);
+  }
+
+  private static int gamePower(String line) {
+    Pattern idpat = Pattern.compile("Game (\\d+):");
+    Pattern gamepat = Pattern.compile("(\\d+) (red|green|blue)(, (\\d+) (red|green|blue))*(;|\\Z)");
+    Pattern drawpat = Pattern.compile("(\\d+) (red|green|blue)");
+
+    Matcher idmat = idpat.matcher(line);
+    idmat.find();
+    int id = Integer.parseInt(idmat.group(1));
+
+    int red = 0, green = 0, blue = 0;
+
+    Matcher gamemat = gamepat.matcher(line);
+    while (gamemat.find()) {
+      Matcher drawmat = drawpat.matcher(line.substring(gamemat.start(), gamemat.end()));
+      while (drawmat.find()) {
+        int num = Integer.parseInt(drawmat.group(1));
+        switch (drawmat.group(2)) {
+          case "red":
+            if (num > red) {
+              red = num;
+            }
+            break;
+          case "green":
+            if (num > green) {
+              green = num;
+            }
+            break;
+          case "blue":
+            if (num > blue) {
+              blue = num;
+            }
+        }
+      }
+    }
+
+    return red * blue * green;
+  }
+}
-- 
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