Initial commit, day 1 and 2

LICENSE

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+Copyright (c) 2021 earnest ma <me@earne.link>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+Be Gay, Do Crimes
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# AOC 2021 personal solutions
+
+It's my first year doing [Advent of Code](https://adventofcode.com) (and doing more coding), and I'm doing it in java :/ (because that's what I'm currently learning as part of the ICS4U course).

day01.java

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+// In around 20 minutes
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class day01 {
+    public static void main(String[] args) throws IOException {
+        int hasIncreasedCounter = 0;
+        int lineCounter = 1;
+
+        int firstnum = 0;
+        int nextnum = 0;
+
+        String line; // convert to int or something
+
+        BufferedReader in = new BufferedReader(new FileReader("day01-input.txt"));
+
+        line = in.readLine();
+        while (line != null) {
+
+            if (lineCounter == 1) { // first line, no firstnum, set
+                firstnum = Integer.valueOf(line).intValue();
+                System.out.println("First entry " + firstnum);
+            }
+            else { // continue, as usual
+                nextnum = Integer.valueOf(line).intValue();
+
+                System.out.println("Comparing " + firstnum + " and " + nextnum);
+
+                if (nextnum > firstnum) {
+                    System.out.println("Yes!");
+                    hasIncreasedCounter++;
+                }
+                else {
+                    System.out.println("Not bigger");
+                }
+
+                firstnum = nextnum; // swap to continue
+            }
+
+            lineCounter++;
+            // continue
+            line = in.readLine();
+        }
+        in.close(); // bye
+
+        System.out.println("Final is " + hasIncreasedCounter);
+
+    }
+}

day01Part2.java

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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class day01Part2 {
+    public static void main(String[] args) throws IOException {
+        int hasIncreasedCounter = 0;
+        int lineCounter = 1;
+
+        int firstnum = 0;
+        int secondnum = 0;
+        int thirdnum = 0;
+
+        int oldsum = 0;
+        int newsum = 0;
+
+        String line; // convert to int or something
+
+        BufferedReader in = new BufferedReader(new FileReader("day01-input.txt"));
+
+        line = in.readLine();
+        while (line != null) {
+
+            if (lineCounter == 1) { // first lines in file
+                firstnum = Integer.valueOf(line).intValue();
+            }
+            else if (lineCounter == 2) {
+                secondnum = Integer.valueOf(line).intValue();
+            }
+            else if (lineCounter == 3) {
+                thirdnum = Integer.valueOf(line).intValue();
+            }
+            else {
+                oldsum = firstnum + secondnum + thirdnum;
+
+				// swapping done here
+                firstnum = secondnum;
+                secondnum = thirdnum;
+				// read new line as thirdnum
+                thirdnum = Integer.valueOf(line).intValue();
+
+                newsum = firstnum + secondnum + thirdnum;
+
+                System.out.println("Comparing " + oldsum + " and " + newsum);
+
+                if (newsum > oldsum) {
+                    System.out.println("Yes!");
+                    hasIncreasedCounter++;
+                }
+                else {
+                    System.out.println("Not bigger");
+                }
+
+                // oldsum = newsum; // swap to continue
+            }
+
+            lineCounter++;
+            // continue
+            line = in.readLine();
+        }
+        in.close(); // bye
+
+        System.out.println("Final is " + hasIncreasedCounter);
+
+    }
+}

day02.java

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+// so how do we parse this file?
+// .split("regex here...")
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class day02 {
+	public static void main(String[] args) throws IOException {
+		int posHorizontal = 0;
+		int posDepth = 0;
+		int finalAns = 0; // posHorizontal * posDepth
+
+		String line;
+
+		String direction;
+		int movement;
+
+		BufferedReader in = new BufferedReader(new FileReader("day02-input.txt"));
+		line = in.readLine();
+		while (line != null) {
+
+			String[] lineProcess = line.split(" ");
+			
+			direction = lineProcess[0];
+			movement = Integer.valueOf(lineProcess[1]).intValue();
+
+			if (direction.compareTo("forward") == 0) {
+				posHorizontal += movement;
+
+			}
+			else if (direction.compareTo("up") == 0) {
+				posDepth -= movement;
+			}
+			else if (direction.compareTo("down") == 0) {
+				posDepth += movement;
+			}
+
+			line = in.readLine();
+		}
+
+		in.close();
+
+		finalAns = posHorizontal * posDepth;
+		System.out.println(finalAns);
+	}
+
+}

day02Part2.java

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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+
+public class day02Part2 {
+	public static void main(String[] args) throws IOException {
+		int posHorizontal = 0;
+		int posDepth = 0;
+		int aim = 0;
+		int finalAns = 0; // posHorizontal * posDepth
+
+		String line;
+
+		String direction;
+		int movement;
+
+		BufferedReader in = new BufferedReader(new FileReader("day02-input.txt"));
+		line = in.readLine();
+		while (line != null) {
+
+			String[] lineProcess = line.split(" ");
+			
+			direction = lineProcess[0];
+			movement = Integer.valueOf(lineProcess[1]).intValue();
+
+			if (direction.compareTo("forward") == 0) {
+				int temp = 0;
+
+				posHorizontal += movement;
+
+				temp = movement * aim;
+				posDepth += temp;
+			}
+			else if (direction.compareTo("up") == 0) {
+				// posDepth -= movement;
+				aim -= movement;
+				
+			}
+			else if (direction.compareTo("down") == 0) {
+				// posDepth += movement;
+				aim += movement;
+			}
+
+			line = in.readLine();
+		}
+
+		in.close();
+
+		finalAns = posHorizontal * posDepth;
+		System.out.println(finalAns);
+	}
+
+}