1 files changed, 68 insertions, 0 deletions
diff --git a/2018/aoc2018-d12.py b/2018/aoc2018-d12.py
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+#advent of code 2018 
+#day 12
+#part 1 & part 2
+
+generationnumber1 = 20; #part1
+generationnumber2 = 10000; #steady state 
+generationnumber3 = 50000000000; #part2
+
+f = open("input.txt", 'r');
+
+testing = False;
+#testing = True;
+if testing:
+	f.close();
+	f = open("testinput.txt", 'r');
+	
+PlantInitialState = f.readline();
+PlantInitialState = PlantInitialState.replace("initial state: ","");
+PlantInitialState = PlantInitialState.replace("\n","");
+f.readline();
+
+Notes = {};
+
+for l in f:
+	n1 = l[0:5];
+	n2 = l[9];
+	Notes[n1] = n2;
+	print(l, end="");
+
+#append to the beginning and the end an a=4 amount of pots
+#store the amount of appended pots
+
+PlantInitialState = "...." + PlantInitialState + "....";
+a = 4;
+PlantCurrentState = PlantInitialState;
+
+part1 = 0;
+
+for g in range(generationnumber2):
+	substate = PlantCurrentState[0:2];
+	substate += Notes.get(PlantCurrentState[0:5]);
+	for p in range(3,len(PlantCurrentState)-2):
+		substate += Notes.get(PlantCurrentState[p-2:p+3]);
+	substate += PlantCurrentState[-2:];
+	if(substate[2] == '#'):
+		substate = ".." + substate;
+		a += 2;
+	if(substate[-3] == '#'):
+		substate = substate + "..";
+	PlantCurrentState = substate;
+	if (g == generationnumber1 -1):
+		for pot in range(len(PlantCurrentState)):
+			if PlantCurrentState[pot] == '#':
+				part1 += pot - a;
+
+
+SteadyState10k = 0;
+for pot in range(len(PlantCurrentState)):
+	if PlantCurrentState[pot] == '#':
+		SteadyState10k += pot - a;
+
+gendiv = generationnumber3//generationnumber2;
+part2 = SteadyState10k*(gendiv);
+
+print("part1: ", part1);
+print("part2: ", part2);
+
+#2830 too low