AOC-2022/Day21.java at master · Fillz/AOC-2022 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
import java.util.ArrayList;
import java.util.HashMap;

public class Day21 {
	public static void main(String[] args) {
		new Day21();
	}

	public Day21() {
		ArrayList<String> input = ReadInput.read("res/input21.txt");
		partOne(input);
		partTwo(input);
	}

	private void partOne(ArrayList<String> input) {
		HashMap<String, Yell> monkeyYells = parseInput(input);
		System.out.println(calculateNumber("root", monkeyYells));
	}

	private void partTwo(ArrayList<String> input) {
		HashMap<String, Yell> monkeyYells = parseInput(input);
		calculateNumber("root", monkeyYells);
		YellOperation rootYell = (YellOperation) monkeyYells.get("root");

		long soughtValue;
		String startMonkey;
		if(rootYell.humanSide.equals("left")) {
			soughtValue = calculateNumber(rootYell.right, monkeyYells);
			startMonkey = rootYell.left;
		}
		else {
			soughtValue = calculateNumber(rootYell.left, monkeyYells);
			startMonkey = rootYell.right;
		}

		long res = calculateHumanYell(startMonkey, soughtValue, monkeyYells);
		System.out.println(res);

	}

	private long calculateHumanYell(String currentMonkeyName, long currentValue, HashMap<String, Yell> monkeyYells) {
		YellOperation currentMonkey = (YellOperation) monkeyYells.get(currentMonkeyName);
		if(currentMonkey.humanSide.equals("left")) {
			long rightValue = calculateNumber(currentMonkey.right, monkeyYells);
			if(currentMonkey.operation == '+') {
				if(monkeyYells.get(currentMonkey.left) instanceof YellNumber)
					return currentValue - rightValue;
				return calculateHumanYell(currentMonkey.left, currentValue - rightValue, monkeyYells);
			}
			else if(currentMonkey.operation == '-') {
				if(monkeyYells.get(currentMonkey.left) instanceof YellNumber)
					return currentValue + rightValue;
				return calculateHumanYell(currentMonkey.left, currentValue + rightValue, monkeyYells);
			}
			else if(currentMonkey.operation == '*') {
				if(monkeyYells.get(currentMonkey.left) instanceof YellNumber)
					return currentValue / rightValue;
				return calculateHumanYell(currentMonkey.left, currentValue / rightValue, monkeyYells);
			}
			else {
				if(monkeyYells.get(currentMonkey.left) instanceof YellNumber)
					return currentValue * rightValue;
				return calculateHumanYell(currentMonkey.left, currentValue * rightValue, monkeyYells);
			}
		}
		else {
			long leftValue = calculateNumber(currentMonkey.left, monkeyYells);
			if(currentMonkey.operation == '+') {
				if(monkeyYells.get(currentMonkey.right) instanceof YellNumber)
					return currentValue - leftValue;
				return calculateHumanYell(currentMonkey.right, currentValue - leftValue, monkeyYells);
			}
			else if(currentMonkey.operation == '-') {
				if(monkeyYells.get(currentMonkey.right) instanceof YellNumber)
					return currentValue + leftValue;
				return calculateHumanYell(currentMonkey.right, leftValue - currentValue, monkeyYells);
			}
			else if(currentMonkey.operation == '*') {
				if(monkeyYells.get(currentMonkey.right) instanceof YellNumber)
					return currentValue / leftValue;
				return calculateHumanYell(currentMonkey.right, currentValue / leftValue, monkeyYells);
			}
			else {
				if(monkeyYells.get(currentMonkey.right) instanceof YellNumber)
					return leftValue / currentValue;
				return calculateHumanYell(currentMonkey.right, leftValue / currentValue, monkeyYells);
			}
		}
	}

	private long calculateNumber(String currentMonkey, HashMap<String, Yell> monkeyYells) {
		Yell y = monkeyYells.get(currentMonkey);
		if(y instanceof YellNumber) {
			YellNumber yn = (YellNumber) y;
			return yn.number;
		}
		else {
			YellOperation yo = (YellOperation) y;
			long leftNumber = calculateNumber(yo.left, monkeyYells);
			long rightNumber = calculateNumber(yo.right, monkeyYells);
			Yell left = monkeyYells.get(yo.left);
			Yell right = monkeyYells.get(yo.right);

			if((left instanceof YellNumber && ((YellNumber) left).isHuman) || (left instanceof YellOperation) && ((YellOperation) left).containsHuman) {
				yo.containsHuman = true;
				yo.humanSide = "left";
			}
			else if((right instanceof YellNumber && ((YellNumber) right).isHuman) || (right instanceof YellOperation) && ((YellOperation) right).containsHuman) {
				yo.containsHuman = true;
				yo.humanSide = "right";
			}

			if(yo.operation == '+')
				return leftNumber + rightNumber;
			else if(yo.operation == '-')
				return leftNumber - rightNumber;
			else if(yo.operation == '*')
				return leftNumber * rightNumber;
			else
				return leftNumber / rightNumber;
		}
	}

	private HashMap<String, Yell> parseInput(ArrayList<String> input) {
		HashMap<String, Yell> map = new HashMap<String, Yell>();
		for(String line : input) {
			String name = line.split(":")[0];
			String s = line.split(": ")[1];
			if(s.contains("+") || s.contains("-") || s.contains("*") || s.contains("/")) {
				String left = s.split(" ")[0];
				char operation = s.split(" ")[1].charAt(0);
				String right = s.split(" ")[2];
				map.put(name, new YellOperation(operation, left, right));
			}
			else {
				YellNumber yn = new YellNumber(Long.parseLong(s));
				if(name.equals("humn"))
					yn.isHuman = true;

				map.put(name, yn);
			}
		}
		return map;
	}

	private interface Yell {}

	private class YellNumber implements Yell {
		public boolean isHuman;
		public long number;
		public YellNumber(long number) {
			this.number = number;
			this.isHuman = false;
		}
	}

	private class YellOperation implements Yell {
		public boolean containsHuman;
		public String humanSide;
		public char operation;
		public String left, right;
		public YellOperation(char operation, String left, String right) {
			this.operation = operation;
			this.left = left;
			this.right = right;
		}
	}
}