50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
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#! /usr/bin/env python3
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def part1(instructions):
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instruction_pointer = 0
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accumulator = 0
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visited_instructions = set()
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while instruction_pointer not in visited_instructions: # return before executing any instruction a second time
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if instruction_pointer >= len(instructions): # stop the program when ip is out of bounds
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break
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visited_instructions.add(instruction_pointer)
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instruction, argument = instructions[instruction_pointer].split(" ")
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if instruction == "acc":
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accumulator += int(argument)
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instruction_pointer += 1
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elif instruction == "jmp":
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value = int(argument)
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instruction_pointer += value
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else:
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instruction_pointer += 1
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return instruction_pointer, accumulator
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def part2(instructions):
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for index, line in enumerate(instructions):
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permutation = generate_permutation(instructions, line, index)
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if permutation is None:
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continue
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instruction_pointer, accumulator = part1(permutation)
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if instruction_pointer == len(permutation):
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return accumulator
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def generate_permutation(instructions, line, index):
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permutation = instructions[:]
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instruction, arg = line.split(" ")
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if instruction == "acc": # don't replace acc operations
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return
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elif instruction == "nop":
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permutation[index] = f"jmp {arg}"
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elif instruction == "jmp":
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permutation[index] = f"nop {arg}"
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return permutation
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if __name__ == "__main__":
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instructions = [line.rstrip() for line in open("input.txt")]
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print("Part 1 : (ip, acc) ", part1(instructions)[1])
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print("Part 2 : (ip, acc) ", part2(instructions))
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