2022/day07.awk


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function parent(dir) {
	p = match(dir, "/[^/]+$");
	return substr(dir, 1, p-1);
}
/\$ cd \// {
	cwd = "/";
	next;
}
/\$ cd \.\./ {
	cwd = parent(cwd);
	next;
}
/\$ cd/ {
	cwd = cwd "/" $3;
}
/^[0-9]+/ {
	for (dir = cwd; dir != ""; dir = parent(dir)) {
		dirs[dir] += $1;
	}
}
END {
	for (dir in dirs) {
		if (dirs[dir] > 100000) continue;
		sum += dirs[dir];
	}
	print sum;
	used = dirs["/"];
	unused = 70000000 - used;
	needed = 30000000 - unused;
	min = used;
	for (dir in dirs) {
		if (dirs[dir] < needed) continue;
		if (dirs[dir] < min) min = dirs[dir];
	}
	print min;
}