From 47fb1fcdd89e39803e44312e7a542a93b5e43b30 Mon Sep 17 00:00:00 2001
From: inga-lovinde <52715130+inga-lovinde@users.noreply.github.com>
Date: Wed, 9 Dec 2020 01:20:47 +0100
Subject: [PATCH] solution for day 3

---
 day03/Cargo.toml  |  9 ++++++++
 day03/src/main.rs | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 day03/Cargo.toml
 create mode 100644 day03/src/main.rs

diff --git a/day03/Cargo.toml b/day03/Cargo.toml
new file mode 100644
index 0000000..9d75ae4
--- /dev/null
+++ b/day03/Cargo.toml
@@ -0,0 +1,9 @@
+[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]
diff --git a/day03/src/main.rs b/day03/src/main.rs
new file mode 100644
index 0000000..6f809bb
--- /dev/null
+++ b/day03/src/main.rs
@@ -0,0 +1,59 @@
+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);
+}