solution for day 3

day03/Cargo.toml

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+[package]
+name = "day03"
+version = "0.1.0"
+authors = ["inga-lovinde <52715130+inga-lovinde@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day03/src/main.rs

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+use std::io::{self, BufRead};
+
+fn get_number_of_trees(right: usize, down: usize, board: &[Vec<char>]) -> usize {
+    let mut x = 0;
+    let mut y = 0;
+    let mut trees = 0;
+    while x < board.len() {
+        let line = &board[x];
+        if (line[y] == '#') {
+            trees = trees + 1;
+        }
+
+        x += down;
+        y = (y + right) % line.len();
+    }
+
+    trees
+}
+
+fn main() {
+    let stdin = io::stdin();
+    let board: Vec<Vec<_>> = stdin.lock().lines()
+        .map(|line| line.unwrap().chars().collect())
+        .collect();
+
+    let mut product = 1u64;
+
+    {
+        let result = get_number_of_trees(1, 1, &board);
+        println!("{}", result);
+        product = product * (result as u64);
+    }
+
+    {
+        let result = get_number_of_trees(3, 1, &board);
+        println!("{}", result);
+        product = product * (result as u64);
+    }
+
+    {
+        let result = get_number_of_trees(5, 1, &board);
+        println!("{}", result);
+        product = product * (result as u64);
+    }
+
+    {
+        let result = get_number_of_trees(7, 1, &board);
+        println!("{}", result);
+        product = product * (result as u64);
+    }
+
+    {
+        let result = get_number_of_trees(1, 2, &board);
+        println!("{}", result);
+        product = product * (result as u64);
+    }
+
+    println!("{}", product);
+}