adventofcode2018/19.py at master · karoberts/adventofcode2018 · GitHub

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import re

pat_cmd = re.compile(r'^([a-z]+) (\d+) (\d+) (\d+)$')

program = []
with open('19.txt') as f:
    st = 0
    cur_op = None

    #program.append({'op': 'seti', 'args': [1, 0, 0], 'l': 'seti 1 0 0'})

    for line in (l.strip() for l in f):
        if line.startswith('#'):
            continue

        m = pat_cmd.match(line)
        program.append({'op': m.group(1), 'args': [int(m.group(2)),int(m.group(3)),int(m.group(4))], 'l': line})

regs = [0, 0, 0, 0, 0, 0]

# part 2
part2 = True

if part2:
    regs[0] = 1
    # 10551367 = 2801 × 3767

    """
     2: r4 = 1                      ip = 2      ip = 3

     3: r2 = r1 * r4                ip = 3      ip = 4
     4: r2 = r2 == r5 ? 1 : 0       ip = 4      ip = 5
     5: r3 += r2                    ip = 5      ip = 5 + r2 + 1
     6: r3 += 1                     ip = 6      ip = 7 + 1

     7: r0 += r1

     8: r4 += 1                     ip = 8      ip = 9
     9: r2 = r4 > r5 ? 1 : 0        ip = 9      ip = 10
    10: r3 += r2                    ip = 10     ip = 10 + r2 + 1
    11: r3 = 2                      ip = 11     ip = 2 + 1

    12: r1 += 1                     ip = 12     ip = 13
    13: r2 = r1 > r5 ? 1 : 0        ip = 13     ip = 14
    14: r3 += r2                    ip = 14     ip = 14 + r2 + 1
    15: r3 = 1                      ip = 14     ip = 1 + 1

    16: r3 *= r3                    ip = 16     ip = r3^2 + 1
    """

# ip=9 [0, 1, 0, 9, 1831, 10551367] gtrr 4 5 2[0, 1, 0, 9, 1831, 10551367]
    regs = [0, 1, 0, 9, 10551366, 10551367]
    regs = [1, 2, 0, 9, 10551366, 10551367]
    regs = [1, 2800, 0, 9, 10551366, 10551367]
    regs = [1, 2801, 0, 9, 3766, 10551367]
    regs = [6569, 10551367, 0, 9, 1, 10551367]
    regs = [10557936, 10551367, 0, 9, 10551366, 10551367]

# part 2 = r0 = 1 + 2801 + 3767 + 10551367
# every time r1*r4 == 10551367, r1 gets added to r0.  So every factor (1,2801,3767)

ipreg = 3
stmts = 0
while True:
    if regs[ipreg] >= len(program) or regs[ipreg] < 0:
        print('HALT')
        break

    stmts += 1
    ip = regs[ipreg]
    pline = program[ip]
    #if stmts % 100000 == 0:
    #    print(stmts)
    #print('ip', ip)
    #if ip == 7 or stmts % 100000 == 0:
     #   print(regs[4])
    #print('ip={} {} {}'.format(regs[ipreg], regs, pline['l']), end='')
    op = pline['op']
    a = pline['args'][0]
    b = pline['args'][1]
    c = pline['args'][2]

    if op == 'addr':
        regs[c] = regs[a] + regs[b]
    elif op == 'addi':
        regs[c] = regs[a] + b
    elif op == 'mulr':
        regs[c] = regs[a] * regs[b]
    elif op == 'muli':
        regs[c] = regs[a] * b
    elif op == 'banr':
        regs[c] = regs[a] & regs[b]
    elif op == 'bani':
        regs[c] = regs[a] & b
    elif op == 'borr':
        regs[c] = regs[a] | regs[b]
    elif op == 'bori':
        regs[c] = regs[a] | b
    elif op == 'setr':
        regs[c] = regs[a]
    elif op == 'seti':
        regs[c] = a
    elif op == 'gtir':
        regs[c] = 1 if a > regs[b] else 0
    elif op == 'gtri':
        regs[c] = 1 if regs[a] > b else 0
    elif op == 'gtrr':
        regs[c] = 1 if regs[a] > regs[b] else 0
    elif op == 'eqir':
        regs[c] = 1 if a == regs[b] else 0
    elif op == 'eqri':
        regs[c] = 1 if regs[a] == b else 0
    elif op == 'eqrr':
        regs[c] = 1 if regs[a] == regs[b] else 0

    #print(regs)

#   if regs[ipreg] == 2 and regs == [0, 1, 0, 2, 1000, 10551367]:
#       print('found1', stmts)
#       regs[4] = 10551366

#   if stmts > 8013 and regs[ipreg] == 2 and regs == [1, 2, 0, 2, 38993, 10551367]:
#       print('found2', stmts)
#       regs[4] = 10551366

#   if stmts > 38993 and regs[ipreg] == 2 and regs == [1, 3, 0, 2, 4469, 10551367]:
#       print('found3', stmts)
#       regs[4] = 2801
#       regs[1] = 3766

    regs[ipreg] += 1

print(regs)