Added year directories for advent of code

advent_of_code/2021/d4/src/main.rs

@@ -0,0 +1,133 @@
+use std::io::{self, BufRead};
+use std::path::Path;
+use std::fs::File;
+use std::collections::HashMap;
+
+use text_io::scan;
+
+
+// -- PART 1 --
+
+// We playin bingo now
+// Input is first a sequence of integers
+// Followed by a number of bingo cards
+// Goal is to find the bingo card that has bingo first and calculate some metrics of it
+// Metrics are the last called number multiplied by sum of all numbers that were not needed for bingo
+
+#[derive(Debug,PartialEq)]
+struct Card {
+    numbers : HashMap<u64, (usize, usize)>,
+    opens : [[bool; 5]; 5],
+    score : u64,
+}
+
+impl Card {
+    fn new() -> Card {
+        Card { numbers: HashMap::new(), opens: [[true; 5]; 5], score: 0 }
+    }
+
+    fn call(&mut self, n: u64) -> Option<u64> {
+        let search_result = self.numbers.get(&n);
+
+        match search_result {
+            None => return None,
+            Some(&coords) => return self.take(n, coords),
+        }
+    }
+
+    fn take(&mut self, n: u64, (x, y): (usize, usize)) -> Option<u64> {
+        self.score -= n;
+        self.opens[x][y] = false;
+
+        match self.check((x, y)) {
+            false => return None,
+            true => return Some(self.score),
+        }
+    }
+
+    fn check(&self, (x, y): (usize, usize)) -> bool {
+        let mut result_x = true;
+        let mut result_y = true;
+
+        for b in self.opens[x] {
+            if b {
+                result_x = false;
+            }
+        }
+
+        for i in 0..self.opens.len() {
+            if self.opens[i][y] {
+                result_y = false;
+            }
+        }
+
+        return result_x || result_y;
+    }
+
+    fn insert(&mut self, n: u64, coords: (usize, usize)) -> () {
+        self.numbers.insert(n, coords);
+        self.score += n;
+    }
+}
+
+fn main(){
+    println!("Advent of Code #4!\n");
+
+    let path = Path::new("./4.txt");
+    let display = path.display();
+
+    let file = match File::open(&path) {
+        Err(why) => panic!("Couldn't open {}: {}", display, why),
+        Ok(file) => file,
+    };
+
+    let mut lines = io::BufReader::new(file).lines();
+    let mut numbers = Vec::<u32>::new();
+    let mut bingo_cards = Vec::<Card>::new();
+
+    // let mut c = Card::new();
+    // c.insert(1, (0, 1));
+    // c.insert(2, (1, 1));
+    // c.insert(3, (2, 1));
+    // c.insert(4, (3, 1));
+    // c.insert(5, (4, 1));
+
+    // assert_eq!(c.call(1), None);
+    // assert_eq!(c.call(2), None);
+    // assert_eq!(c.call(3), None);
+    // assert_eq!(c.call(4), None);
+    // assert_eq!(c.call(5), Some(0));
+
+    let first_line = lines.nth(0).unwrap().unwrap();
+    let mut acc: u32 = 0;
+    for c in first_line.chars() {
+        if c != ',' && c != '\n' {
+            acc *= 10;
+            acc += c.to_digit(10).unwrap();
+        } else{
+            numbers.push(acc);
+            acc = 0;
+        }
+    }
+
+    let mut n_start = 2;
+    let mut bingo_start_line = lines.nth(n_start);
+
+    while !bingo_start_line.is_none() {
+        let card = Card::new();
+
+        for i in 0..5 {
+            let cur_line = lines.nth(n_start + i).unwrap().unwrap();
+            let a: i32;
+            let b: i32;
+            let c: i32;
+            let d: i32;
+            let e: i32;
+            scan!(cur_line.bytes() => "{} {} {} {} {}", a, b, c, d, e);
+            println!("{} {} {} {} {}", a, b, c, d, e);
+        }
+
+        n_start += 6;
+        bingo_start_line = lines.nth(n_start);
+    }
+}