From 92524aa912db99becc1b3446d5b68b9cc089c721 Mon Sep 17 00:00:00 2001
From: Julian Hurst <julian.hurst@digdash.com>
Date: Tue, 3 Dec 2024 16:42:45 +0100
Subject: Initial commit

---
 1/1.ha | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1/in   |  6 ++++++
 2/2.ha | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2/in   |  6 ++++++
 3/3.ha | 31 +++++++++++++++++++++++++++++++
 3/in   |  1 +
 6 files changed, 149 insertions(+)
 create mode 100644 1/1.ha
 create mode 100644 1/in
 create mode 100644 2/2.ha
 create mode 100644 2/in
 create mode 100644 3/3.ha
 create mode 100644 3/in

diff --git a/1/1.ha b/1/1.ha
new file mode 100644
index 0000000..a6a5d94
--- /dev/null
+++ b/1/1.ha
@@ -0,0 +1,49 @@
+use fmt;
+use bufio;
+use os;
+use shlex;
+use strings;
+use strconv;
+use sort;
+use sort::cmp;
+
+export fn main() void = {
+	const sc = bufio::newscanner(os::stdin);
+	defer bufio::finish(&sc);
+
+	let l1: []int = [];
+	let l2: []int = [];
+	defer free(l1);
+	defer free(l2);
+	for (const line => bufio::scan_line(&sc)!) {
+		const tok = strings::tokenize(line, " ");
+		let isfirst = true;
+		for (const t => strings::next_token(&tok)) {
+			if (t == "") {
+				continue;
+			};
+			const x = strconv::stoi(t)!;
+			if (isfirst) {
+				append(l1, x);
+				isfirst = false;
+			} else {
+				append(l2, x);
+			};
+		};
+	};
+	sort::sort(l1, size(int), &cmp::ints);
+	sort::sort(l2, size(int), &cmp::ints);
+	let sum = 0;
+	for (let i = 0z; i < len(l1); i += 1) {
+		const l = l1[i];
+		const j = l2[i];
+		const diff = if (l > j) {
+			yield (l, j, l - j);
+		} else {
+			yield (j, l, j - l);
+		};
+		fmt::printfln("{} - {} = {}", diff.0, diff.1, diff.2)!;
+		sum += diff.2;
+	};
+	fmt::println(sum)!;
+};
diff --git a/1/in b/1/in
new file mode 100644
index 0000000..f0aa1c6
--- /dev/null
+++ b/1/in
@@ -0,0 +1,6 @@
+3  4
+4  3
+2  5
+1  3
+3  9
+3  3
diff --git a/2/2.ha b/2/2.ha
new file mode 100644
index 0000000..83ba3b8
--- /dev/null
+++ b/2/2.ha
@@ -0,0 +1,56 @@
+use fmt;
+use bufio;
+use os;
+use strings;
+use strconv;
+
+export fn main() void = {
+	const sc = bufio::newscanner(os::stdin);
+	defer bufio::finish(&sc);
+
+	let safereports = 0;
+	for (const line => bufio::scan_line(&sc)!) {
+		const spl = strings::split(line, " ");
+		defer free(spl);
+		let safe = true;
+		let inc: (bool | void) = void;
+		for (let i = 1z; i < len(spl); i += 1) {
+			const s1 = strconv::stoi(spl[i-1])!;
+			const s2 = strconv::stoi(spl[i])!;
+			const diff = if (s1 < s2) {
+				match (inc) {
+				case void =>
+					inc = true;
+				case let inc: bool =>
+					if (!inc) {
+						safe = false;
+						break;
+					};
+				};
+				yield s2 - s1;
+			} else {
+				match (inc) {
+				case void =>
+					inc = false;
+				case let inc: bool =>
+					if (inc) {
+						safe = false;
+						break;
+					};
+				};
+				yield s1 - s2;
+			};
+			if (diff <= 0 || diff > 3) {
+				safe = false;
+				break;
+			};
+		};
+		if (safe) {
+			fmt::printfln("{}: Safe", line)!;
+			safereports += 1;
+		} else {
+			fmt::printfln("{}: Unsafe", line)!;
+		};
+	};
+	fmt::printfln("{} reports are safe", safereports)!;
+};
diff --git a/2/in b/2/in
new file mode 100644
index 0000000..b49c10d
--- /dev/null
+++ b/2/in
@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9
diff --git a/3/3.ha b/3/3.ha
new file mode 100644
index 0000000..f4d3ac5
--- /dev/null
+++ b/3/3.ha
@@ -0,0 +1,31 @@
+use fmt;
+use io;
+use os;
+use regex;
+use strings;
+use strconv;
+
+export fn main() void = {
+	const in = io::drain(os::stdin)!;
+	const sin = strings::trim(strings::fromutf8_unsafe(in));
+	const re = regex::compile(`mul\([0-9]+,[0-9]+\)`)!;
+	defer regex::finish(&re);
+
+	const results = regex::findall(&re, sin);
+	defer regex::result_freeall(results);
+	let sum = 0;
+	for (const result .. results) {
+		for (let r .. result) {
+			const idx1 = strings::index(r.content, ',');
+			const idx2 = strings::index(r.content, ')');
+			const arg1 = strings::sub(r.content, 4, idx1: size);
+			const arg2 = strings::sub(r.content, idx1: size + 1, idx2: size);
+
+			const a1 = strconv::stoi(arg1)!;
+			const a2 = strconv::stoi(arg2)!;
+			sum += a1 * a2;
+			fmt::printfln("{} * {} = {}", a1, a2, a1 * a2)!;
+		};
+	};
+	fmt::printfln("{}", sum)!;
+};
diff --git a/3/in b/3/in
new file mode 100644
index 0000000..f274bda
--- /dev/null
+++ b/3/in
@@ -0,0 +1 @@
+xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
-- 
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