add initial data

aoc01/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc01"
+version = "0.1.0"

aoc01/Cargo.toml

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+[package]
+name = "aoc01"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

aoc01/src/data.txt

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+199
+200
+208
+210
+200
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+240
+269
+260
+263

aoc01/src/main.rs

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+use std::fs;
+
+fn main() {
+    let data = read_data("data.txt");
+    let increase_count = process(&data);
+    println!("Increasing values: {}", increase_count);
+    let increase_count = process_windowed(&data);
+    println!("Increasing values windowed: {}", increase_count);
+}
+
+fn read_data(filename: &str) -> String {
+    fs::read_to_string(filename).expect("Could not read file")
+}
+
+fn process(data: &str) -> i32 {
+    let mut last_value = i32::MAX;
+    let mut increase_count = 0;
+    for line in data.lines() {
+        let value = line.parse::<i32>().unwrap();
+        if value > last_value {
+            increase_count += 1
+        }
+        last_value = value;
+    }
+    increase_count
+}
+
+fn process_windowed(data: &str) -> i32 {
+    let mut last_value = i32::MAX;
+    let mut increase_count = 0;
+    for i in 0..1998 {
+        let mut value = 0;
+        for j in 0..3 {
+            value += data.lines().nth(i + j).unwrap().parse::<i32>().unwrap();
+        }
+        if value > last_value {
+            increase_count += 1
+        }
+        last_value = value;
+    }
+    increase_count
+}
+