add initial data

aoc06/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc06"
+version = "0.1.0"

aoc06/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "aoc06"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

aoc06/data.txt

@@ -0,0 +1 @@
+1,3,4,1,1,1,1,1,1,1,1,2,2,1,4,2,4,1,1,1,1,1,5,4,1,1,2,1,1,1,1,4,1,1,1,4,4,1,1,1,1,1,1,1,2,4,1,3,1,1,2,1,2,1,1,4,1,1,1,4,3,1,3,1,5,1,1,3,4,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,5,2,5,5,3,2,1,5,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,5,1,1,1,1,5,1,1,1,1,1,4,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,3,1,2,4,1,5,5,1,1,5,3,4,4,4,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,5,3,1,4,1,1,2,2,1,2,2,5,1,1,1,2,1,1,1,1,3,4,5,1,2,1,1,1,1,1,5,2,1,1,1,1,1,1,5,1,1,1,1,1,1,1,5,1,4,1,5,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,5,4,5,1,1,1,1,1,1,1,5,1,1,3,1,1,1,3,1,4,2,1,5,1,3,5,5,2,1,3,1,1,1,1,1,3,1,3,1,1,2,4,3,1,4,2,2,1,1,1,1,1,1,1,5,2,1,1,1,2

aoc06/src/main.rs

@@ -0,0 +1,58 @@
+const SIZE: usize = 10;
+const REPRODUCTIVE_CYCLE: usize = 6;
+const SPAWN_GENERATION: usize = 8;
+const OVERFLOW: usize = 9;
+
+struct Population {
+    data: [i128; SIZE]
+
+}
+
+impl Population {
+    fn get_new_spawn(&self) -> i128 {
+        self.data[OVERFLOW]
+    }
+
+    fn reset_new_spawn(&mut self) {
+        self.data[OVERFLOW] = 0
+    }
+
+    fn iterate(&mut self, generations: i32) {
+        for _i in 0..generations {
+            self.data.rotate_left(1);
+            self.data[REPRODUCTIVE_CYCLE] += self.get_new_spawn();
+            self.data[SPAWN_GENERATION] = self.get_new_spawn();
+            self.reset_new_spawn();
+        }
+    }
+
+    fn calc_sum(&self) -> i128 {
+        let mut result = 0;
+        for item in self.data {
+            result += item;
+        }
+        result
+    }
+}
+
+fn main() {
+    let mut data = load_data("data.txt");
+    data.iterate(256);
+    let sum = data.calc_sum();
+    println!("lanternfish: {}", sum);
+}
+
+fn load_data(filename: &str) -> Population {
+    let content = std::fs::read_to_string(filename).unwrap();
+    let mut data: [i128; SIZE] = [0; SIZE];
+    for elements in content.split(",") {
+        println!("{:?}", elements);
+        let value = elements.parse::<i32>();
+        let x = match value {
+            Ok(x) => x as usize,
+            Err(_e) => break
+        };
+        data[x] += 1;
+    }
+    Population{data}
+}

aoc06/testdata.txt

@@ -0,0 +1 @@
+3,4,3,1,2