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december_1_2/Cargo.toml

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+[package]
+name = "december_1_2"
+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_2/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 number_of_bigger_values: i32 = 0;
+    let mut previous_sum = -1;
+    let mut values: Vec<i32> = Vec::new();
+
+    let all_lines = reader.lines();
+
+
+    for line in all_lines{
+        values.push(line.expect("-1").parse::<i32>().unwrap());
+    }
+
+    for x in 2..values.len(){
+        println!("{}", x);
+        let sum = values[x] + values[x-1] + values[x-2];
+        if previous_sum != -1 && sum > previous_sum {
+            number_of_bigger_values += 1;
+        }
+        previous_sum = sum;
+    }
+
+
+
+    println!("Bigger values: {}", number_of_bigger_values)
+
+
+
+}