Added AOC 2020 day 03 - 14

www/statics/aoc/2020/03_solution.rs

@@ -0,0 +1,55 @@
+use crate::common::AdventOfCodeDay;
+
+pub struct Day03 {
+    width: i32,
+    height: i32,
+    input: Vec<Vec<bool>>,
+}
+
+impl Day03 {
+    pub fn new() -> Self {
+        let input_bytes = include_bytes!("../res/03_input.txt");
+        let input_str = String::from_utf8_lossy(input_bytes);
+        
+        let lines = input_str.lines().map(String::from).collect::<Vec<String>>();
+
+        Self {
+            width: lines[0].len() as i32,
+            height: lines.len() as i32,
+
+            input: lines.iter().map(|l| l.chars().map(|c| c=='#').collect()).collect(),
+        }
+    }
+
+    pub fn get(&self, x: i32, y: i32) -> bool {
+        if y >= self.height { return false }
+        return self.input[y as usize][(x % self.width) as usize]
+    }
+
+    pub fn treecount(&self, dx: i32, dy: i32) -> i32 {
+        (0..self.height).filter(|y| self.get(dx*y, dy*y)).count() as i32
+    }
+}
+
+impl AdventOfCodeDay for Day03 {
+
+    fn task_1(&self) -> String {
+        return self.treecount(3, 1).to_string()
+    }
+
+    fn task_2(&self) -> String  {
+        verboseln!("[1,1]: {}", self.treecount(1, 1));
+        verboseln!("[3,1]: {}", self.treecount(3, 1));
+        verboseln!("[5,1]: {}", self.treecount(5, 1));
+        verboseln!("[7,1]: {}", self.treecount(7, 1));
+        verboseln!("[1,2]: {}", self.treecount(1, 2));
+
+        let prod = self.treecount(1, 1) *
+                   self.treecount(3, 1) *
+                   self.treecount(5, 1) *
+                   self.treecount(7, 1) *
+                   self.treecount(1, 2);
+
+        return prod.to_string();
+    }
+}