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const std = @import("std");
const aoc = @import("aoc");
fn part1(allocator: std.mem.Allocator, input: []u8, args: [][]u8) !?[]u8 {
_ = args;
var entryit = std.mem.split(u8, input, "\n\n");
var answer: u32 = 0;
while (entryit.next()) |group| {
var seen = [_]u1{0} ** 256;
for (group) |c| {
if (c == ' ' or c == '\n') continue;
answer += @boolToInt(seen[c] == 0);
seen[c] = 1;
}
}
return try std.fmt.allocPrint(allocator, "{d}", .{answer});
}
fn part2(allocator: std.mem.Allocator, input: []u8, args: [][]u8) !?[]u8 {
_ = args;
var entryit = std.mem.split(u8, input, "\n\n");
var answer: u32 = 0;
while (entryit.next()) |group| {
var count = [_]u16{0} ** 256;
var members: u16 = 0;
var memberit = std.mem.tokenize(u8, group, "\n ");
while (memberit.next()) |member| : (members += 1) {
for (member) |c| count[c] += 1;
}
for (count) |v| answer += @boolToInt(v == members);
}
return try std.fmt.allocPrint(allocator, "{d}", .{answer});
}
pub const main = aoc.main(part1, part2, .{ "6748", "3445" });
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