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december_1_1/Cargo.toml

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+[package]
+name = "december_1_1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

december_1_1/src/main.rs

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+use std::fs::File;
+use std::io::{BufReader};
+use std::io::prelude::*;
+
+fn main(){
+    let file = File::open("./input.txt").expect("Read failed");
+    let reader = BufReader::new(file);
+    let mut previous_value: i32 = -1;
+    let mut number_of_bigger_values: i32 = 0;
+    for line in reader.lines(){
+        let current_value = line.expect("-1").parse::<i32>().unwrap();
+        if previous_value != -1 && current_value > previous_value {
+            number_of_bigger_values += 1;
+        }
+        previous_value = current_value;
+    }
+    println!("Bigger values: {}", number_of_bigger_values)
+
+
+
+}