day7 past1

2023-12-07 12:30:46 -05:00
1 parent 8272d3b62c
commit 4a20a35c2d
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 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 version = 3
 [[package]]
 name = "day07"
 version = "0.1.0"
@@ -0,0 +1,8 @@
 [package]
 name = "day07"
 version = "0.1.0"
 edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [dependencies]
@@ -0,0 +1,1000 @@
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 use std::{fs, collections::HashMap};
 fn main() {
    let input = fs::read_to_string("input.txt").unwrap();
    let mut input: Vec<_> = input.split('\n')
        .map(|line| line.split(' ').collect::<Vec<_>>())
        .collect();
    for line in 0..input.len() {
        let hand = input[line][0];
        let mut card_freq: HashMap<char, i16> = HashMap::new();
        for card in hand.chars() {
            card_freq.entry(card)
                .and_modify(|count| *count += 1)
                .or_insert(1);
        }
        let mut set_count: HashMap<i16, i16> = HashMap::new();
        for i in 1..=5 {
            let card_count = card_freq.values().filter(|x| **x == i).count().try_into().unwrap();
            if card_count != 0 {
                set_count.insert(i, card_count);
            }
        }
        let power = match set_count {
            x if x.contains_key(&5) => "7",
            x if x.contains_key(&4) => "6",
            x if x.contains_key(&3) && x.contains_key(&2) => "5",
            x if x.contains_key(&3) => "4",
            x if x.get(&2).unwrap_or(&0) >= &2 => "3",
            x if x.get(&2).unwrap_or(&0) == &1 => "2",
            HashMap { .. } => "1"
        };
        input[line].push(power);
    }
    input.sort_by(|lhs, rhs| {
        let lhs_power: i32 = lhs[2].parse().unwrap();
        let rhs_power: i32 = rhs[2].parse().unwrap();
        if lhs_power != rhs_power {
            return lhs_power.cmp(&rhs_power);
        }
        let lhs_hand: Vec<i32> = lhs[0].chars().map(card_value).collect();
        let rhs_hand: Vec<i32> = rhs[0].chars().map(card_value).collect();
        for i in 0..5 {
            if lhs_hand[i] == rhs_hand[i] { continue; }
            return lhs_hand[i].cmp(&rhs_hand[i]);
        }
        panic!("Should not be reachable");
    });
    let mut total_winnings = 0;
    for i in 0..input.len() {
        let bid: usize = input[i][1].parse().unwrap();
        total_winnings += (i + 1) * bid;
    }
    println!("{}", total_winnings);
 }
 fn card_value(card: char) -> i32 {
    match card {
        'A' => 13,
        'K' => 12,
        'Q' => 11,
        'J' => 10,
        'T' => 9,
        '9' => 8,
        '8' => 7,
        '7' => 6,
        '6' => 5,
        '5' => 4,
        '4' => 3,
        '3' => 2,
        '2' => 1,
        _ => panic!("invalid card")
    }
 }