Advent of code day 3

day3.c3

@@ -0,0 +1,94 @@
+module day3;
+import std::io;
+import std::map;
+
+define CharSet = HashMap<char, char>;
+
+fn int evaluate(char c)
+{
+	int value = c > 'Z' ? c - 'a' + 1 : c - 'A' + 27;
+	assert(value >= 1 && value <= 52);
+	return value;
+}
+
+fn void part1()
+{
+	File f;
+	f.open("rucksack.txt", "rb")!!;
+	defer catch(f.close());
+	int total = 0;
+	while NEXT: (!f.eof())
+	{
+		@pool()
+		{
+			CharSet set;
+			set.tinit();
+			set.clear();
+			char[] line = f.tgetline();
+			assert(line.len % 2 == 0 && line.len > 0);
+
+			char[] comp1 = line[:line.len / 2];
+			char[] comp2 = line[line.len / 2..];
+
+			foreach (c : comp1) set.set(c, c);
+
+			foreach (c : comp2)
+			{
+				if (try(set.get(c)))
+				{
+					total += evaluate(c);
+					continue NEXT;
+				}
+			}
+			unreachable();
+		};
+	}
+	io::printfln("The sum of priorities is: %d", total);
+}
+
+fn void part2()
+{
+	File f;
+	f.open("rucksack.txt", "rb")!!;
+	defer catch(f.close());
+	int total = 0;
+	while NEXT: (!f.eof())
+	{
+		@pool()
+		{
+			CharSet set;
+			CharSet set2;
+			set.tinit();
+			set2.tinit();
+			char[] line1 = f.tgetline();
+			char[] line2 = f.tgetline();
+			char[] line3 = f.tgetline();
+
+			assert(line1.len && line2.len && line3.len);
+
+			foreach (c : line1) set.set(c, c);
+
+			foreach (c : line2)
+			{
+				if (try(set.get(c))) set2.set(c, c);
+			}
+			foreach (c : line3)
+			{
+				if (try(set2.get(c)))
+				{
+					set2.set(c, c);
+					total += evaluate(c);
+					continue NEXT;
+				}
+			}
+			unreachable();
+		};
+	}
+	io::printfln("The sum of badges is: %d", total);
+}
+
+fn void main()
+{
+	part1();
+	part2();
+}

rucksack.txt

@@ -0,0 +1,300 @@
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