Day 1

.gitignore

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+/target

Cargo.lock

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

Cargo.toml

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+[package]
+name = "aoc"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[[bin]]
+name = "one"
+path = "src/01.rs"
+
+[[bin]]
+name = "two"
+path = "src/02.rs"

src/01.rs

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+use std::{fs::File, io::Read};
+
+fn main() {
+    // ------ PART ONE --------
+    //
+    let filename = "input.txt";
+    let file_result = File::open(filename);
+    let mut file = match file_result {
+        Ok(file)  => file,
+        Err(error)  => panic!("{}", error),
+    };
+    let mut contents = String::new();
+    match file.read_to_string(&mut contents) {
+        Ok(_) => {},
+        Err(error)  => panic!("{}", error),
+    }
+
+    let mut elf : usize  = 0;
+    let mut calories :Vec<i32> = Vec::new();
+    for line in contents.lines() {
+        if line.is_empty() {
+            elf += 1
+        } else {
+            // add mnissing vec element
+            if calories.len() == elf {
+                calories.push(0);
+            }
+
+            let c = match line.parse::<u32>() {
+                Ok(result) => result,
+                Err(error)  => panic!("bitch you got strings in your numbies {}", error),
+            };
+
+            calories[elf] += c as i32;
+        }
+    }
+
+
+    let mut max = 0;
+    for c in calories {
+        if c > max {
+            max = c
+        }
+    }
+    println!("Max Calories is  {}", max);
+
+    // ------ PART TWO --------
+    calories.sort();
+    println!("top{}", top_n(&calories, 1)+top_n(&calories, 2)+top_n(&calories,  3));
+}
+
+fn top_n(vector : &Vec<i32>, n: u32)-> i32 {
+    return vector[vector.len() -(n as usize)];
+}