「🎉」 init(2025): day 1

2024/day07/.envrc

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+use flake

2024/day07/flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1733220138,
+        "narHash": "sha256-Yh5XZ9yVurrcYdNTSWxYgW4+EJ0pcOqgM1043z9JaRc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "bcb68885668cccec12276bbb379f8f2557aa06ce",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-24.05",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

2024/day07/flake.nix

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+{
+  description = "a minimal test development environment for ruby";
+
+  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; [
+          gcc ruby
+        ];
+        shellHook = ''
+          export CC=gcc
+          echo -e "\x1B[0;33mentering ruby minimalist test development environment...\x1B[0m"
+        '';
+      };
+    };
+  };
+}

2024/day07/part1.rb

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+if File.exists?("input.txt")
+  file = File.open("input.txt")
+  file_data = file.read
+  file.close
+else
+  file_data = "190: 10 19\n3267: 81 40 27\n83: 17 5\n156: 15 6\n7290: 6 8 6 15\n161011: 16 10 13\n192: 17 8 14\n21037: 9 7 18 13\n292: 11 6 16 20"
+end
+
+def eval_left_to_right(expression)
+  tokens = expression.split(/(\+|\*)/).map(&:strip)
+
+  result = tokens.shift.to_i
+  until tokens.empty?
+    operator = tokens.shift
+    operand = tokens.shift.to_i
+
+    result = result.send(operator, operand)
+  end
+
+  result
+end
+
+#puts file_data
+data_array = file_data.split("\n")
+results = []
+values = []
+
+for line in data_array do
+  res, val = line.split(":").map(&:strip)
+  res = res.to_i
+  val = val.split.map(&:to_i)
+  results.push(res)
+  values.push(val)
+end
+
+puts results.inspect
+puts values.inspect
+
+res = 0
+operations = ['+', '*']
+
+results.each_with_index do |result, index|
+  puts "\nindex: #{index} | #{result} : #{values[index]}"
+
+  combinations = operations.repeated_permutation(values[index].length - 1).to_a
+
+  combinations.each do |comb|
+    expr = values[index].zip(comb).flatten.compact.join
+    puts "#{expr} = #{eval_left_to_right(expr)}"
+
+    if eval_left_to_right(expr) == result
+      puts "#{result}"
+      res += result
+      break
+    end
+
+  end
+end
+
+puts res

2024/day07/part2.rb

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+if File.exists?("input.txt")
+  file = File.open("input.txt")
+  file_data = file.read
+  file.close
+else
+  file_data = "190: 10 19\n3267: 81 40 27\n83: 17 5\n156: 15 6\n7290: 6 8 6 15\n161011: 16 10 13\n192: 17 8 14\n21037: 9 7 18 13\n292: 11 6 16 20"
+end
+
+def eval_left_to_right(expression)
+  tokens = expression.split(/(\+|\*|\|\|)/).map(&:strip)
+
+  result = tokens.shift.to_i
+  until tokens.empty?
+    operator = tokens.shift
+    operand = tokens.shift.to_i
+
+    if (operator == '||')
+      result = (result.to_s + operand.to_s).to_i
+    else
+      result = result.send(operator, operand)
+    end
+  end
+
+  result
+end
+
+#puts file_data
+data_array = file_data.split("\n")
+results = []
+values = []
+
+for line in data_array do
+  res, val = line.split(":").map(&:strip)
+  res = res.to_i
+  val = val.split.map(&:to_i)
+  results.push(res)
+  values.push(val)
+end
+
+puts results.inspect
+puts values.inspect
+
+res = 0
+operations = ['+', '*', '||']
+
+results.each_with_index do |result, index|
+  #puts "\nindex: #{index} | #{result} : #{values[index]}"
+
+  combinations = operations.repeated_permutation(values[index].length - 1).to_a
+
+  combinations.each do |comb|
+    expr = values[index].zip(comb).flatten.compact.join
+    #puts "#{expr} = #{eval_left_to_right(expr)}"
+
+    if eval_left_to_right(expr) == result
+      #puts "#{result}"
+      res += result
+      break
+    end
+
+  end
+end
+
+puts res