Advent of code day 10

code.txt

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+addx 1
+addx 5
+noop
+addx -1
+noop
+addx 3
+addx 29
+addx -1
+addx -21
+addx 5
+noop
+addx -20
+addx 21
+addx 2
+addx 8
+addx -1
+noop
+noop
+noop
+noop
+addx 6
+addx -1
+addx -37
+addx 40
+addx -10
+addx -25
+addx 5
+addx 2
+addx 5
+noop
+noop
+noop
+addx 21
+addx -20
+addx 2
+noop
+addx 3
+addx 2
+addx -5
+addx 12
+addx 3
+noop
+addx 2
+addx 3
+addx -2
+addx -37
+addx 1
+addx 5
+addx 3
+addx -2
+addx 2
+addx 29
+addx -22
+addx 13
+noop
+addx -8
+addx -6
+addx 7
+addx 2
+noop
+addx 7
+addx -2
+addx 5
+addx 2
+addx -26
+addx -11
+noop
+noop
+addx 6
+addx 1
+addx 1
+noop
+addx 4
+addx 5
+noop
+noop
+addx -2
+addx 3
+noop
+addx 2
+addx 5
+addx 2
+addx -22
+addx 27
+addx -1
+addx 1
+addx 5
+addx 2
+noop
+addx -39
+addx 22
+noop
+addx -15
+addx 3
+addx -2
+addx 2
+addx -2
+addx 9
+addx 3
+noop
+addx 2
+addx 3
+addx -2
+addx 2
+noop
+noop
+noop
+addx 5
+addx -17
+addx 24
+addx -7
+addx 8
+addx -36
+addx 2
+addx 3
+addx 33
+addx -32
+addx 4
+addx 1
+noop
+addx 5
+noop
+noop
+addx 20
+addx -15
+addx 4
+noop
+addx 1
+noop
+addx 4
+addx 6
+addx -30
+addx 30
+noop
+noop
+noop
+noop
+noop

day10.c3

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+module day10;
+import std::io;
+
+fn int update_signal_strength(int cycle, int x)
+{
+	if ((cycle + 20) % 40 == 0)
+	{
+		return x * cycle;
+	}
+	return 0;
+}
+
+fn void draw_crt(bool[40][6]* crt)
+{
+	foreach (bool[40]* &row : *crt)
+	{
+		foreach(pixel : *row)
+		{
+			io::print(pixel ? "#" : " ");
+		}
+		io::println();
+	}
+}
+
+fn void update_crt(bool[40][6]* crt, int cycle, int x)
+{
+	int col = (cycle - 1) % 40;
+	int row = (cycle - 1) / 40;
+	if (x - 1 <= col && x + 1 >= col)
+	{
+		(*crt)[row][col] = true;
+	}
+}
+
+fn void part2()
+{
+	File f;
+	f.open("code.txt", "rb")!!;
+	defer catch(f.close());
+	bool[40][6] crt;
+	int cycle = 0;
+	int x = 1;
+	while (!f.eof())
+	{
+		@pool()
+		{
+			char[] line = f.tgetline();
+            char[][] commands = str::tsplit(line, " ");
+            switch (commands[0])
+            {
+                case "noop":
+                    cycle++;
+                    update_crt(&crt, cycle, x);
+                case "addx":
+                    cycle++;
+                    update_crt(&crt, cycle, x);
+                    cycle++;
+                    update_crt(&crt, cycle, x);
+                    x += str::to_int(commands[1])!!;
+                default:
+                    unreachable("Invalid input");
+            }
+		};
+	}
+	draw_crt(&crt);
+}
+fn void part1()
+{
+	File f;
+	f.open("code.txt", "rb")!!;
+	defer catch(f.close());
+	int cycle = 0;
+	int x = 1;
+	int signal_strength = 0;
+	while (!f.eof())
+	{
+		@pool()
+		{
+			char[] line = f.tgetline();
+            char[][] commands = str::tsplit(line, " ");
+            switch (commands[0])
+            {
+                case "noop":
+                    cycle++;
+                    signal_strength += update_signal_strength(cycle, x);
+                case "addx":
+                    cycle++;
+                    signal_strength += update_signal_strength(cycle, x);
+                    cycle++;
+                    signal_strength += update_signal_strength(cycle, x);
+                    x += str::to_int(commands[1])!!;
+                default:
+                    unreachable("Invalid input");
+            }
+            if (cycle > 222) break;
+		};
+	}
+	io::printfln("Signal strength: %d", signal_strength);
+}
+
+fn void main()
+{
+	part1();
+	part2();
+}