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const std = @import("std");
const print = std.debug.print;
const assert = std.debug.assert;
const ArrayList = std.ArrayList;
const HashMap = std.HashMap;
const mem = std.mem;
const fin = mem.trim(u8, @embedFile("./input.txt"), &std.ascii.whitespace);
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const allocator = gpa.allocator();
const Combo = enum(u32) {
high,
pair1,
pair2,
triple,
full,
quad,
quint,
};
const Player = struct {
bid: u64,
hand: [5]u8,
combo: Combo,
fn evalHand(self: *@This(), withJoker: bool) void {
var cardF = [_]u32{0} ** 256;
var cmax: usize = 0;
for (self.hand) |c| {
cardF[c] += 1;
if (withJoker and c != 'J' and cardF[c] > cardF[cmax]) {
cmax = c;
}
}
if (withJoker) {
cardF[cmax] += cardF['J'];
cardF['J'] = 0;
}
var combo = Combo.high;
for (cardF) |f| {
combo = switch (f) {
0, 1 => continue,
2 => switch (combo) {
.pair1 => .pair2,
.triple => .full,
else => .pair1,
},
3 => if (combo == Combo.pair1) .full else .triple,
4 => .quad,
5 => .quint,
else => unreachable,
};
}
self.combo = combo;
}
pub fn init(hand: []const u8, bid: u64) Player {
var res: Player = undefined;
res.bid = bid;
mem.copy(u8, &res.hand, hand);
return res;
}
pub fn deinit(self: @This()) void {
allocator.free(self.hand);
}
};
fn cardValue(c: u8) u64 {
return switch (c) {
'2'...'9' => c - '0',
'T' => 10,
'J' => 11,
'Q' => 12,
'K' => 13,
'A' => 14,
else => unreachable,
};
}
fn cardValueWithJoker(c: u8) u64 {
return switch (c) {
'2'...'9' => c - '0',
'T' => 10,
'J' => 0,
'Q' => 12,
'K' => 13,
'A' => 14,
else => unreachable,
};
}
fn cmpCard(valueFunc: *const fn (u8) u64, lhs: u8, rhs: u8) bool {
return valueFunc(lhs) < valueFunc(rhs);
}
fn playerCmp(valueFunc: *const fn (u8) u64, lhs: Player, rhs: Player) bool {
if (lhs.combo != rhs.combo) {
return @intFromEnum(lhs.combo) < @intFromEnum(rhs.combo);
}
for (lhs.hand, rhs.hand) |l, r| {
if (l != r) {
return cmpCard(valueFunc, l, r);
}
}
return false;
}
pub fn part1(players: []Player) void {
var ans: u64 = 0;
for (players) |*p| {
p.evalHand(false);
}
mem.sort(Player, players, &cardValue, playerCmp);
for (players, 1..) |p, rank| {
ans += p.bid * rank;
}
print("{d}\n", .{ans});
}
pub fn part2(players: []Player) void {
var ans: u64 = 0;
for (players) |*p| {
p.evalHand(true);
}
mem.sort(Player, players, &cardValueWithJoker, playerCmp);
for (players, 1..) |p, rank| {
ans += p.bid * rank;
}
print("{d}\n", .{ans});
}
pub fn main() !void {
var splitLines = mem.splitScalar(u8, fin, '\n');
var players = ArrayList(Player).init(allocator);
defer {
players.deinit();
}
while (splitLines.next()) |line| {
var splitElem = mem.splitScalar(u8, line, ' ');
const hand = splitElem.next().?;
const bid = try std.fmt.parseInt(u64, splitElem.next().?, 10);
try players.append(Player.init(hand, bid));
}
part1(players.items);
part2(players.items);
}
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