From 0c68337917e1a458c8dca87a08974a2b88fe4101 Mon Sep 17 00:00:00 2001
From: Philip Molares <philip.molares@udo.edu>
Date: Sat, 5 Dec 2020 12:47:56 +0100
Subject: [PATCH] added day03

Signed-off-by: Philip Molares <philip.molares@udo.edu>
---
 day03/Cargo.lock  |   5 +
 day03/Cargo.toml  |   9 ++
 day03/input.txt   | 323 ++++++++++++++++++++++++++++++++++++++++++++++
 day03/src/main.rs |  51 ++++++++
 4 files changed, 388 insertions(+)
 create mode 100644 day03/Cargo.lock
 create mode 100644 day03/Cargo.toml
 create mode 100644 day03/input.txt
 create mode 100644 day03/src/main.rs

diff --git a/day03/Cargo.lock b/day03/Cargo.lock
new file mode 100644
index 0000000..21127a2
--- /dev/null
+++ b/day03/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "day03"
+version = "0.1.0"
diff --git a/day03/Cargo.toml b/day03/Cargo.toml
new file mode 100644
index 0000000..ff17ccc
--- /dev/null
+++ b/day03/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "day03"
+version = "0.1.0"
+authors = ["Philip Molares <philip.molares@udo.edu>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/day03/input.txt b/day03/input.txt
new file mode 100644
index 0000000..92b6208
--- /dev/null
+++ b/day03/input.txt
@@ -0,0 +1,323 @@
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diff --git a/day03/src/main.rs b/day03/src/main.rs
new file mode 100644
index 0000000..bde5bfa
--- /dev/null
+++ b/day03/src/main.rs
@@ -0,0 +1,51 @@
+use std::fs::File;
+use std::io::{self, prelude::*, BufReader};
+
+fn count_trees(input: &Vec<Vec<bool>>, right: usize, down: usize) -> i64 {
+    let mut hit_trees = 0;
+    let mut cord_x = 0;
+    let mut cord_y = 0;
+
+    while cord_y < input.len() {
+        if input[cord_y][cord_x] {
+            hit_trees += 1;
+        }
+
+        cord_x = (cord_x + right) % input[cord_y].len();
+        cord_y += down;
+    }
+    hit_trees
+}
+
+fn main() -> io::Result<()> {
+    println!("Advent of Code 2020 – Day 3:");
+
+    let file = File::open("input.txt")?;
+    let reader = BufReader::new(file);
+
+    let input = reader
+        .lines()
+        .map(|l| {
+            l.unwrap()
+            .chars()
+            .map(|c| c == '#')
+            .collect::<Vec<bool>>()
+        })
+        .collect::<Vec<Vec<bool>>>();
+
+    
+    let answer = count_trees(&input, 3, 1);
+
+    println!("Answer Part 1: {}", answer);
+
+    let answer2 = count_trees(&input, 1, 1);
+    let answer3 = count_trees(&input, 5, 1);
+    let answer4 = count_trees(&input, 7, 1);
+    let answer5 = count_trees(&input, 1, 2);
+
+    let product = answer * answer2 * answer3 * answer4 * answer5;
+
+    println!("Answer Part 2: {}", product);
+
+    Ok(())
+}
-- 
GitLab