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const eql = std.mem.eql;
const parseUnsigned = std.fmt.parseUnsigned;
const print = std.debug.print;
const std = @import("std");
const tokenize = std.mem.tokenize;
pub fn main() !void {
var position = @as(usize, 0);
var depth = @as(usize, 0);
defer print("{}\n", .{ position * depth });
var aim = @as(usize, 0);
var input = tokenize(@embedFile("input"), "\n");
while (input.next()) |line| {
var command = tokenize(line, " ");
const direction = command.next().?;
const x = try parseUnsigned(usize, command.next().?, 10);
if (eql(u8, direction, "forward")) {
position += x;
depth += aim * x;
} else if (eql(u8, direction, "down")) {
aim += x;
} else if (eql(u8, direction, "up")) {
aim -= x;
} else unreachable;
}
}
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