const std = @import("std"); const example = @embedFile("example"); const input = @embedFile("input"); pub fn main() anyerror!void { const result = try solve(input); try std.io.getStdOut().writer().print("{}\n", .{result}); } fn solve(puzzle: []const u8) !u64 { var it = std.mem.tokenize(u8, puzzle, "\n"); var pos: u64 = 0; var depth: u64 = 0; while (it.next()) |line| { var it2 = std.mem.tokenize(u8, line, " "); const step = it2.next() orelse unreachable; const n: u64 = std.fmt.parseInt(u64, it2.next().?, 10) catch unreachable; switch (step[0]) { 'f' => pos += n, 'd' => depth += n, 'u' => depth -= n, else => unreachable, } } return pos * depth; } test "solve" { try std.testing.expectEqual(solve(example), 150); }