advent_of_code2019/puzzle05.py at master · flothesof/advent_of_code2019 · 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
def run(program, input_value):
    index = 0
    prints = []
    while True:
        instruction = program[index]
        op_str = f"{instruction:05}"  # pad with zeros if necessary
        op = op_str[-2:]
        A, B, C = op_str[0], op_str[1], op_str[2]
        jump = False
        # add
        if op == '01':
            nincrement = 4
            if C == '0':
                first = program[program[index + 1]]
            else:
                first = program[index + 1]
            if B == '0':
                second = program[program[index + 2]]
            else:
                second = program[index + 2]
            assert A == '0'
            program[program[index + 3]] = first + second
        # multiply
        elif op == '02':
            nincrement = 4
            if C == '0':
                # position
                first = program[program[index + 1]]
            else:
                # immediate
                first = program[index + 1]
            if B == '0':
                second = program[program[index + 2]]
            else:
                second = program[index + 2]
            assert A == '0'
            program[program[index + 3]] = first * second
        # input saved to address
        elif op == '03':
            nincrement = 2
            assert C == '0'
            addr = program[index + 1]
            program[addr] = input_value
        # output
        elif op == '04':
            nincrement = 2
            if C == '0':
                addr = program[index + 1]
            else:
                addr = index + 1
            prints.append(program[addr])
        # jump if true
        elif op == '05':
            if C == '0':
                first_param = program[program[index + 1]]
            else:
                first_param = program[index + 1]
            if B == '0':
                second_param = program[program[index + 2]]
            else:
                second_param = program[index + 2]
            if first_param != 0:
                jump = True
                new_index = second_param
            else:
                nincrement = 3
        # jump if false
        elif op == '06':
            if C == '0':
                first_param = program[program[index + 1]]
            else:
                first_param = program[index + 1]
            if B == '0':
                second_param = program[program[index + 2]]
            else:
                second_param = program[index + 2]
            if first_param == 0:
                jump = True
                new_index = second_param
            else:
                nincrement = 3
        # less than
        elif op == '07':
            nincrement = 4
            if C == '0':
                first = program[program[index + 1]]
            else:
                first = program[index + 1]
            if B == '0':
                second = program[program[index + 2]]
            else:
                second = program[index + 2]
            assert A == '0'
            if first < second:  # strict?
                program[program[index + 3]] = 1
            else:
                program[program[index + 3]] = 0
        # equals
        elif op == '08':
            nincrement = 4
            if C == '0':
                first = program[program[index + 1]]
            else:
                first = program[index + 1]
            if B == '0':
                second = program[program[index + 2]]
            else:
                second = program[index + 2]
            assert A == '0'
            if first == second:
                program[program[index + 3]] = 1
            else:
                program[program[index + 3]] = 0
        # end program
        elif op == '99':
            break
        else:
            raise NotImplementedError()
        if jump:
            index = new_index
            del new_index
        else:
            index = index + nincrement
            del nincrement
    return program, prints


assert run([1002, 4, 3, 4, 33], input_value=1)[0] == [1002, 4, 3, 4, 99]
assert run([1101, 100, -1, 4, 0], input_value=1)[0] == [1101, 100, -1, 4, 99]
program = list(map(int, open('data/input05').read().split(',')))
print(f'solution to part1: {run(program, input_value=1)[1][-1]}')
# we need to reload the program since we modify it in place...
program = list(map(int, open('data/input05').read().split(',')))
print(f'solution to part2: {run(program, input_value=5)[1][-1]}')