day 14

aoc2020/README.md

@@ -1,4 +1,4 @@
-A sample command-line application.
+Advent of Code 2020
-
+Written in Dart
-Created from templates made available by Stagehand under a BSD-style
+to execute:
-[license](https://github.com/dart-lang/stagehand/blob/master/LICENSE).
+dart run bin\main.dart --no-testOnly

aoc2020/lib/aoc2020.dart

@@ -11,6 +11,7 @@ import 'package:aoc2020/aoc20201210.dart';
 import 'package:aoc2020/aoc20201211.dart';
 import 'package:aoc2020/aoc20201212.dart';
 import 'package:aoc2020/aoc20201213.dart';
+import 'package:aoc2020/aoc20201214.dart';
 import 'package:aoc2020/aocbase.dart';
 import 'dart:mirrors';
 
@@ -34,6 +35,7 @@ class aoc2020 {
     AOC20201211(),
     AOC20201212(),
     AOC20201213(),
+    AOC20201214(),
   ];
 
   static void list() async {

aoc2020/lib/aoc20201214.dart

@@ -1,16 +1,62 @@
+import 'package:any_base/any_base.dart';
 import 'package:aoc2020/aocbase.dart';
 import 'package:aoc2020/model/readdata.dart';
+import 'package:tuple/tuple.dart';
 
 class AOC20201214 extends AOCBase {
   var mylist = <String>[];
+  var rawMask = '';
+  Tuple2<int, int> mask;
+  var mem = <int, int>{};
+
+  static const max = 274877906943;
+  static const dec2bin = AnyBase(AnyBase.dec, AnyBase.bin);
+  static const bin2dec = AnyBase(AnyBase.bin, AnyBase.dec);
 
   void init(bool test) async {
     mylist = await ReadData.readFile<String>(classString, test: test);
   }
 
+  void setMem(int address, int val) => mem[address] = applyMask(val);
+  int applyMask(int val) => (val | mask.item1) & mask.item2;
+  void setMask(String _rawMask) {
+    rawMask = _rawMask;
+    var _orMask = int.parse(bin2dec.convert(_rawMask.replaceAll('X', '0')));
+    var _andMask = int.parse(bin2dec.convert(_rawMask.replaceAll('X', '1')));
+    mask = Tuple2(_orMask, _andMask);
+  }
+
+  void setMaskSection2(String _rawMask) {
+// find all 'X's
+// find position of all X's
+// binarily cycle through all binary numbers posible make a list of masks
+  }
+
+  int applyMaskSection2(int val) => (val | mask.item1) & mask.item2;
+
+  void setMemSection2(int address, int val) {
+    mem[address] = applyMask(val);
+  }
+
   @override
   Future<void> a({bool test}) async {
+
     await init(test);
+    mem.clear();
+
+    for (var line in mylist) {
+      var split1 = line.split(' = ');
+      var cmd = split1[0];
+      var val = split1[1];
+      if (cmd == 'mask') {
+        setMask(val);
+      } else {
+        var address = int.parse(cmd.split('[')[1].split(']')[0]);
+        var value = int.parse(val);
+        setMem(address, value);
+      }
+    }
+    answerA = mem.values.reduce((a,b) => a + b);
   }
 
   @override

aoc2020/pubspec.yaml

@@ -9,7 +9,7 @@ environment:
 
 dependencies:
   tuple: ^1.0.3
-#  path: ^1.6.0
+  any_base:
 
 dev_dependencies:
   pedantic: ^1.7.0