const std = @import("std");

const Char = enum(u2) {
    Galaxy,
    Empty,
};

fn solve(projections: [2][]const u32) u32 {
    var result: u32 = 0;

    for (projections) |projection| {
        var i: usize = 0;
        while (i < projection.len) : (i += 1) {
            if (projection[i] == 0) {
                continue;
            }

            var distance: u32 = 0;
            var j = i + 1;
            while (j < projection.len) : (j += 1) {
                if (projection[j] == 0) {
                    distance += 2;
                } else {
                    distance += 1;
                    result += projection[i] * projection[j] * distance;
                }
            }
        }
    }

    return result;
}

fn charLinesToProjections(allocator: std.mem.Allocator, char_lines: [][]const Char) ![2][]const u32 {
    var rows = try allocator.alloc(u32, char_lines.len);
    var columns = try allocator.alloc(u32, char_lines[0].len);
    @memset(rows, 0);
    @memset(columns, 0);
    for (char_lines, 0..) |char_line, i| {
        for (char_line, 0..) |char, j| {
            if (char == .Galaxy) {
                rows[i] += 1;
                columns[j] += 1;
            }
        }
    }

    return .{ rows, columns };
}

fn readInput(allocator: std.mem.Allocator, reader: anytype) ![][]const Char {
    var lines = std.ArrayList([]Char).init(allocator);
    var line_buffer: [1000]u8 = undefined;
    while (try reader.readUntilDelimiterOrEof(&line_buffer, '\n')) |line_ref| {
        var line = try allocator.alloc(Char, line_ref.len);
        for (line_ref, line) |raw_char, *char| {
            char.* = switch (raw_char) {
                '#' => .Galaxy,
                '.' => .Empty,
                else => unreachable,
            };
        }
        try lines.append(line);
    }

    return lines.items;
}

pub fn main() !void {
    const stdout = std.io.getStdOut().writer();

    const raw_in = std.io.getStdIn();
    var buffered_reader = std.io.bufferedReader(raw_in.reader());
    var reader = buffered_reader.reader();

    var allocator_buffer: [1_000_000]u8 = undefined;
    var fba = std.heap.FixedBufferAllocator.init(&allocator_buffer);
    var allocator = fba.allocator();

    var lines_arena = std.heap.ArenaAllocator.init(allocator);
    const lines_allocator = lines_arena.allocator();
    const char_lines = try readInput(lines_allocator, reader);

    var projections_arena = std.heap.ArenaAllocator.init(allocator);
    const projections_allocator = projections_arena.allocator();
    const projections = try charLinesToProjections(projections_allocator, char_lines);
    lines_arena.deinit();

    const result = solve(projections);
    projections_arena.deinit();

    try stdout.print("{d}\n", .{result});
}