From 5a23d15ff9bb69d9e9b52e543596e75af3b090f9 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Mon, 2 Dec 2024 06:46:28 +0100
Subject: Day 2 2024

---
 2024/02/Makefile   |  24 ++++++++++++++++++++++++
 2024/02/b.out      | Bin 0 -> 152640 bytes
 2024/02/day02a.cpp |  30 ++++++++++++++++++++++++++++++
 2024/02/day02b.cpp |  48 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 102 insertions(+)
 create mode 100644 2024/02/Makefile
 create mode 100755 2024/02/b.out
 create mode 100644 2024/02/day02a.cpp
 create mode 100644 2024/02/day02b.cpp

(limited to '2024/02')

diff --git a/2024/02/Makefile b/2024/02/Makefile
new file mode 100644
index 0000000..c3cdac5
--- /dev/null
+++ b/2024/02/Makefile
@@ -0,0 +1,24 @@
+CC=g++ -std=c++20 -g -Wall
+
+a:
+	${CC} -o a.out day02a.cpp
+
+b:
+	${CC} -o b.out day02b.cpp
+
+clean:
+	rm -f a b
+
+atest: a
+	./a.out
+
+btest: b
+	./b.out
+
+arun: a
+	./a.out < input
+
+brun: b
+	./b.out < input
+
+.PHONY: a b clean atest btest arun brun
diff --git a/2024/02/b.out b/2024/02/b.out
new file mode 100755
index 0000000..fc29aef
Binary files /dev/null and b/2024/02/b.out differ
diff --git a/2024/02/day02a.cpp b/2024/02/day02a.cpp
new file mode 100644
index 0000000..cdd9efa
--- /dev/null
+++ b/2024/02/day02a.cpp
@@ -0,0 +1,30 @@
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <algorithm>
+#include <string>
+using namespace std;
+
+bool isvalid(const string &line) {
+	int x, y, b;
+	istringstream s(line);
+
+	s >> x >> y;
+	b = x > y ? 1 : -1;
+	do {
+		int d = b * (x-y);
+		if (d < 1 || d > 3)
+			return false;
+		x = y;
+	} while (s >> y);
+
+	return true;
+}
+
+int main() {
+	int tot = 0;
+	for (string line; getline(cin, line); )
+		tot += isvalid(line);
+	cout << tot << endl;
+	return 0;
+}
diff --git a/2024/02/day02b.cpp b/2024/02/day02b.cpp
new file mode 100644
index 0000000..2e3dcf4
--- /dev/null
+++ b/2024/02/day02b.cpp
@@ -0,0 +1,48 @@
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <algorithm>
+#include <string>
+using namespace std;
+
+bool isvalid_v(const vector<int> &v) {
+	int b = v[0] > v[1] ? 1 : -1;
+	for (unsigned i = 0; i < v.size()-1; i++) {
+		int d = b * (v[i] - v[i+1]);
+		if (d < 1 || d > 3)
+			return false;
+	}
+	return true;
+}
+
+vector<int> getv(const string &line) {
+	int x;
+	vector<int> ret;
+	istringstream s(line);
+
+	while(s >> x)
+		ret.push_back(x);
+
+	return ret;
+}
+
+bool isvalid(const string &line) {
+	vector v0 = getv(line);
+	if (isvalid_v(v0))
+		return true;
+	for (unsigned i = 0; i < v0.size(); i++) {
+		vector v = v0;
+		v.erase(v.begin() + i);
+		if (isvalid_v(v))
+			return true;
+	}
+	return false;
+}
+
+int main() {
+	int tot = 0;
+	for (string line; getline(cin, line); )
+		tot += isvalid(line);
+	cout << tot << endl;
+	return 0;
+}
-- 
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