item = index position - list of list

[ThomasL]

not exactly. v would be only one integer value.
and before as explained in the text. It´s important to read the text carefully always. :-)

Here´s my function which can be used for both parts of the day.

Hide/Show

def run(code, noun, verb):
    code[1], code[2] = noun, verb
    pointer = 0
    while True:
        opcode = code[pointer]
        if opcode == 99:
            break
        if opcode == 1:
            idx1, idx2, idx3 = code[pointer + 1: pointer + 4]
            code[idx3] = code[idx1] + code[idx2]
            pointer += 4
        elif opcode == 2:
            # try to do this on your own :-)
        else:
            print(f"Error: Unknow Opcode {opcode}")
            break
    return code

result = run(program[:], 12, 2)
print(result[0])