1 files changed, 31 insertions, 0 deletions
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)!;
+};