Discussion on: Advent of Code 2019 Solution Megathread - Day 2: 1202 Program Alarm

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I struggled with reading comprehension tonight 🤦🏼‍♀️

def calculate(num1, num2, nums):
    nums[1] = num1
    nums[2] = num2
    idx = 0
    while nums[idx] != 99:
        num = nums[idx]
        val1 = nums[nums[idx + 1]]
        val2 = nums[nums[idx + 2]]
        idx3 = nums[idx + 3]
        if num == 1:
            nums[idx3] = val1 + val2
        elif num == 2:
            nums[idx3] = val1 * val2
        idx += 4
    return nums[0]


with open("input.txt") as _file:
    for line in _file:
        input_values = [int(num) for num in line.split(",")]
        # part 1
        print(calculate(12, 2, input_values[:]))

        # part 2
        GOAL = 19690720
        for i in range(100):
            for j in range(100):
                if calculate(i, j, input_values[:]) == GOAL:
                    print(100 * i + j) 
                    break