const std = @import("std");
const print = std.debug.print;

pub fn solve(part: []u8, reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
    if (std.mem.eql(u8, part, "1")) {
        try part1(reader, allocator);
    } else {
        try part2(reader, allocator);
    }
}

fn part1(reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
    var output: usize = 0;

    const first = try reader.takeDelimiter('\n');

    var space = try allocator.alloc(bool, first.?.len);
    defer allocator.free(space);

    for (space) |*b| b.* = false;

    space[(first.?.len - 1) / 2] = true;

    while (reader.takeDelimiter('\n')) |line| {
        if (line == null) {
            break;
        }

        for (line.?,0..) |e, i| {
            if (e == '^' and space[i]) {
                space[i] = false;
                space[i-1] = true;
                space[i+1] = true;
                output += 1;
            }
        }

    } else |_| {}

    print("{d}\n", .{output});
}

fn quantum(space: [][]u8, pos: usize, y: usize, output: *usize) void {

    if (space.len == y){
        return;
    }

    if (space[y][pos] == '^') {
        quantum(space, pos - 1, y + 1, output);
        output.* += 1;
        quantum(space, pos + 1, y + 1, output);
    } else {
        quantum(space, pos, y + 1, output);
    }
}


fn part2(reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
    var output: usize = 1;

    const first = try reader.takeDelimiter('\n');

    var space = try allocator.alloc(usize, first.?.len);
    defer allocator.free(space);

    for (space) |*b| b.* = 0;

    space[(first.?.len - 1) / 2] = 1;

    while (reader.takeDelimiter('\n')) |line| {
        if (line == null) {
            break;
        }

        for (line.?,0..) |e, i| {
            if (e == '^' and space[i] > 0) {
                space[i-1] += space[i];
                space[i+1] += space[i];
                output += space[i];
                space[i] = 0;
            }
        }

    } else |_| {}

    print("{d}\n", .{output});
}