「🎉」 init(2025): day 1

2024/day02/.envrc

@@ -0,0 +1 @@
+use flake

2024/day02/flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1733016324,
+        "narHash": "sha256-8qwPSE2g1othR1u4uP86NXxm6i7E9nHPyJX3m3lx7Q4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7e1ca67996afd8233d9033edd26e442836cc2ad6",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-24.05",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

2024/day02/flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "a minimal test development environment for rust";
+
+  inputs = {
+
+    nixpkgs = {
+      url = "nixpkgs/nixos-24.05";
+      flake = false;
+	};
+
+  };
+
+  outputs = inputs@{ nixpkgs, ... }:
+	{
+    devShell = {
+      x86_64-linux = let
+        pkgs = import nixpkgs { system = "x86_64-linux"; };
+	  in pkgs.mkShell {
+        packages = with pkgs; [
+          rustc gcc
+        ];
+        shellHook = ''
+          export CC=gcc
+          echo -e "\x1B[0;33mentering rust minimalist test development environment...\x1B[0m"
+        '';
+      };
+    };
+  };
+}

2024/day02/part1.rs

@@ -0,0 +1,34 @@
+use std::fs;
+
+fn is_ordered(numbers: &[i32]) -> bool
+{
+    let is_increasing = numbers.windows(2).all(|w| w[0] < w[1]);
+    let is_decreasing = numbers.windows(2).all(|w| w[0] > w[1]);
+
+    is_increasing || is_decreasing
+}
+
+fn check_range(numbers: &[i32]) -> bool
+{
+    numbers.windows(2).all(|w| (1..=3).contains(&(w[1] - w[0]).abs()))
+}
+
+fn main() {
+    let content = fs::read_to_string("input.txt")
+        .expect("error with input file.");
+
+    let mut result = 0;
+
+    for lines in content.split('\n')
+    {
+
+        let values: Vec<i32> = lines.split_whitespace().map(|x| x.parse().expect("Invalid number")).collect();
+
+        if is_ordered(&values) && check_range(&values)
+        {
+            result += 1;
+        }
+    }
+
+    println!("{}", result);
+}

2024/day02/part2.rs

@@ -0,0 +1,47 @@
+use std::fs;
+
+fn is_ordered(numbers: &[i32]) -> bool
+{
+    let is_increasing = numbers.windows(2).all(|w| w[0] < w[1]);
+    let is_decreasing = numbers.windows(2).all(|w| w[0] > w[1]);
+
+    is_increasing || is_decreasing
+}
+
+fn check_range(numbers: &[i32]) -> bool
+{
+    numbers.windows(2).all(|w| (1..=3).contains(&(w[1] - w[0]).abs()))
+}
+
+fn main() {
+    let content = fs::read_to_string("input.txt")
+        .expect("error with input file.");
+
+    let mut result = 0;
+
+    for lines in content.split('\n')
+    {
+
+        let values: Vec<i32> = lines.split_whitespace().map(|x| x.parse().expect("Invalid number")).collect();
+
+        if is_ordered(&values) && check_range(&values)
+        {
+            result += 1;
+        }
+        else
+        {
+            for i in 0..values.len()
+            {
+                let mut modified_values = values.to_vec();
+                modified_values.remove(i);
+                if is_ordered(&modified_values) && check_range(&modified_values)
+                {
+                    result += 1;
+                    break;
+                }
+            }
+        }
+    }
+
+    println!("{}", result);
+}