From d544a7b5c7fdb578d4454e274b54c05b6170e7c0 Mon Sep 17 00:00:00 2001
From: Eoghan Conlon <git@eoghanconlon.ie>
Date: Mon, 9 Dec 2024 11:40:18 +0000
Subject: [PATCH 1/2] Day02 files
Signed-off-by: Eoghan Conlon <git@eoghanconlon.ie>
---
src/Day02.java | 174 +++++++++++++++++++++++++++++++++++++++++++++++++
src/Main.java | 29 ++++++++-
2 files changed, 202 insertions(+), 1 deletion(-)
create mode 100644 src/Day02.java
diff --git a/src/Day02.java b/src/Day02.java
new file mode 100644
index 0000000..2556de3
--- /dev/null
+++ b/src/Day02.java
@@ -0,0 +1,174 @@
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class Day02 extends Input{
+ private Input input;
+
+ private ArrayList<int[]> sample;
+ private ArrayList<int[]> actual;
+
+ public Day02() throws IOException {
+ this.input = new Input();
+ this.input.init("in/Day02");
+ }
+
+ public int part1Sample(){
+ int safeReadings = 0;
+
+ this.sample = new ArrayList<>();
+
+ for(String s1: this.input.getSample_input()){
+ String[] teamp_arr = s1.split(" ");
+ int[] temp_intArr = new int[teamp_arr.length];
+ for(int i = 0; i < temp_intArr.length; i += 1){
+ temp_intArr[i] = Integer.parseInt(teamp_arr[i]);
+ }
+ this.sample.add(temp_intArr);
+ }
+
+ return p1_work(safeReadings, sample);
+ }
+
+ public int part1(){
+ int safeReadings = 0;
+
+ this.actual = new ArrayList<>();
+
+ for(String s1: this.input.getInput()){
+ String[] teamp_arr = s1.split(" ");
+ int[] temp_intArr = new int[teamp_arr.length];
+ for(int i = 0; i < temp_intArr.length; i += 1){
+ temp_intArr[i] = Integer.parseInt(teamp_arr[i]);
+ }
+ this.actual.add(temp_intArr);
+ }
+
+ return p1_work(safeReadings, actual);
+ }
+
+ private int p1_work(int safeReadings, ArrayList<int[]> actual) {
+ for(int[] readings : actual){
+ int i = 0;
+ int j = 1;
+ boolean increasing = readings[i] < readings[j];
+ boolean safe = true;
+ while(j < readings.length && safe){
+ int temp = readings[i] - readings[j];
+ if((increasing && ((temp < -3) || (temp > -1))) || (!increasing && ((temp < 1) || (temp > 3)))){
+ safe = false;
+ }
+ j += 1;
+ i += 1;
+ }
+ if(safe){
+ safeReadings += 1;
+ }
+ }
+
+ return safeReadings;
+ }
+
+ public int part2Sample(){
+ int safeReadings = 0;
+
+ this.sample = new ArrayList<>();
+
+ for(String s1: this.input.getSample_input()){
+ String[] teamp_arr = s1.split(" ");
+ int[] temp_intArr = new int[teamp_arr.length];
+ for(int i = 0; i < temp_intArr.length; i += 1){
+ temp_intArr[i] = Integer.parseInt(teamp_arr[i]);
+ }
+ this.sample.add(temp_intArr);
+ }
+
+ for(int[] readings : this.sample){
+ safeReadings = getSafeReadings(safeReadings, readings);
+ }
+
+ return safeReadings;
+ }
+
+ public int part2(){
+ int safeReadings = 0;
+
+ this.actual = new ArrayList<>();
+
+ for(String s1: this.input.getInput()){
+ String[] teamp_arr = s1.split(" ");
+ int[] temp_intArr = new int[teamp_arr.length];
+ for(int i = 0; i < temp_intArr.length; i += 1){
+ temp_intArr[i] = Integer.parseInt(teamp_arr[i]);
+ }
+ this.actual.add(temp_intArr);
+ }
+
+ for(int[] readings : this.actual){
+ safeReadings = getSafeReadings(safeReadings, readings);
+ }
+
+ return safeReadings;
+ }
+
+ private int getSafeReadings(int safeReadings, int[] readings) {
+ int safe = 1;
+ int oldSafeRead = safeReadings;
+ while(safe >= 0 && oldSafeRead == safeReadings){
+ int danger = safe_p2(readings);
+ if(danger == -1){
+ safeReadings += 1;
+ } else {
+ safe -= 1;
+ int[] reading_cut = new int[readings.length - 1];
+ for(int i = 0, j = 0; i < readings.length; i += 1){
+ if(i != danger){
+ reading_cut[j] = readings[i];
+ j += 1;
+ }
+ }
+ if(safe_p2(reading_cut) == -1){
+ safeReadings += 1;
+ } else {
+ for(int i = 0, j = 0; i < readings.length; i += 1){
+ if(i != danger - 1){
+ reading_cut[j] = readings[i];
+ j += 1;
+ }
+ }
+ if(safe_p2(reading_cut) == -1){
+ safeReadings += 1;
+ } else {
+ safe -= 1;
+ }
+ }
+ }
+ }
+ return safeReadings;
+ }
+
+ public int safe_p2(int[] readings){
+ int safe = 0;
+ boolean increasing = readings[0] < readings[1];
+ int i = 0;
+ int j = 1;
+ while(j < readings.length){
+ int diff = readings[i] - readings[j];
+ if(increasing && ((diff < -3) || (diff > -1))){
+ break;
+ } else if (!increasing && ((diff < 1) || (diff > 3))) {
+ break;
+ } else {
+ j += 1;
+ i += 1;
+ }
+ }
+
+ if(j < readings.length){
+ safe = j;
+ } else {
+ safe = -1;
+ }
+
+ return safe;
+ }
+}
diff --git a/src/Main.java b/src/Main.java
index 7066f74..eb5a3a4 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -28,6 +28,33 @@ public class Main {
System.out.printf("Part 1 sample is: %d (%dms)\n", sample_d1_p1_answer, day01_p1_sample);
System.out.printf("Part 1 answer is: %d (%dms)\n", d1_p1_answer, day01_p1);
System.out.printf("Part 2 sample answer is: %d (%dms)\n", sample_d1_p2_answer, day01_p2_sample);
- System.out.printf("Part 2 answer is: %d (%dms)", d1_p2_answer, day01_p2);
+ System.out.printf("Part 2 answer is: %d (%dms)\n", d1_p2_answer, day01_p2);
+
+ System.out.println("\nDay 2:");
+ start = System.currentTimeMillis();
+ Day02 day02 = new Day02();
+ long day02_init = System.currentTimeMillis() - start;
+
+ start = System.currentTimeMillis();
+ int d2_p1_sample = day02.part1Sample();
+ long day02_p1_sample = System.currentTimeMillis() - start;
+
+ start = System.currentTimeMillis();
+ int d2_p1 = day02.part1();
+ long day02_p1 = System.currentTimeMillis() - start;
+
+ start = System.currentTimeMillis();
+ int d2_p2_sample = day02.part2Sample();
+ long day02_p2_sample = System.currentTimeMillis() - start;
+
+ start = System.currentTimeMillis();
+ int d2_p2 = day02.part2();
+ long day02_p2 = System.currentTimeMillis() - start;
+
+ System.out.printf("Day 2 init took %dms\n", day02_init);
+ System.out.printf("Part 1 sample = %d (%dms)\n", d2_p1_sample, day02_p1_sample);
+ System.out.printf("Part 1 answer = %d (%dms)\n", d2_p1, day02_p1);
+ System.out.printf("Part 2 sample = %d (%dms)\n", d2_p2_sample, day02_p2_sample);
+ System.out.printf("Part 2 answer = %d (%dms)\n", d2_p2, day02_p2);
}
}
From b7eff97777584e3f78a0c1957f6390c8216982b2 Mon Sep 17 00:00:00 2001
From: Eoghan Conlon <git@eoghanconlon.ie>
Date: Mon, 9 Dec 2024 12:58:11 +0000
Subject: [PATCH 2/2] Day 02 p2 complete
Signed-off-by: Eoghan Conlon <git@eoghanconlon.ie>
---
src/Day02.java | 20 ++++++--------------
1 file changed, 6 insertions(+), 14 deletions(-)
diff --git a/src/Day02.java b/src/Day02.java
index 2556de3..3b2af2f 100644
--- a/src/Day02.java
+++ b/src/Day02.java
@@ -120,25 +120,17 @@ public class Day02 extends Input{
} else {
safe -= 1;
int[] reading_cut = new int[readings.length - 1];
- for(int i = 0, j = 0; i < readings.length; i += 1){
- if(i != danger){
- reading_cut[j] = readings[i];
- j += 1;
- }
- }
- if(safe_p2(reading_cut) == -1){
- safeReadings += 1;
- } else {
- for(int i = 0, j = 0; i < readings.length; i += 1){
- if(i != danger - 1){
- reading_cut[j] = readings[i];
- j += 1;
+ while(danger >= 0 && oldSafeRead == safeReadings){
+ for(int a = 0, b = 0; a < readings.length; a += 1){
+ if(a != danger){
+ reading_cut[b] = readings[a];
+ b += 1;
}
}
if(safe_p2(reading_cut) == -1){
safeReadings += 1;
} else {
- safe -= 1;
+ danger -= 1;
}
}
}