feat: day3 part2 complete

1 files changed, 53 insertions, 0 deletions

diff --git a/day3/part2/main.ha b/day3/part2/main.ha
new file mode 100644
index 0000000..d05ff25
--- /dev/null
+++ b/day3/part2/main.ha
@@ -0,0 +1,53 @@
+use fmt;
+use io;
+use math;
+use os;
+use strconv::{stou8};
+use strings::{fromutf8_unsafe, split, sub};
+
+fn joltage(bank: str) u64 = {
+	let digits: [12]u8 = [0...];
+	let indexes: [12]size = [0...];
+
+	let total: u64 = 0;
+
+	for (let i: size = 0; i < 12; i += 1) {
+		let next_index: size = 0;
+
+		if (i > 0)
+			next_index = indexes[i - 1] + 1;
+
+		if (i > next_index)
+			next_index = i;
+
+		for (let j: size = next_index; j < len(bank); j += 1) {
+			let val = stou8(sub(bank, j, j + 1))!;
+
+			if (val > digits[i] && j < len(bank) - (11 - i)) {
+				digits[i] = val;
+				indexes[i] = j;
+			};
+		};
+
+		total += (digits[i]: u64 * math::powi64(10, 11 - i: uint): u64);
+	};
+
+	return total;
+};
+
+export fn main() void = {
+	let handle = os::open("input.txt")!;
+	defer io::close(handle)!;
+
+	let buf = io::drain(handle)!;
+	defer free(buf);
+
+	let lines = split(fromutf8_unsafe(buf), "\n")!;
+	let output: u64 = 0;
+
+	for (let line .. lines)
+		if (line != "")
+			output += joltage(line);
+
+	fmt::printfln("Answer: {}", output)!;
+};