fn run_intcode(intcode: &mut std::vec::Vec<usize>) {
    let mut pos = 0;

    println!("\n\nrun with intcode: {:?}", intcode);

    while intcode[pos] != 99 {
        print!("run code:");
        pos = match intcode[pos] {
            1 => {
                let in1 = intcode[intcode[pos + 1]];
                let in2 = intcode[intcode[pos + 2]];
                let pos_out = intcode[pos + 3];
                println!(
                    "add[{}]: value:{} + value:{} -> pos:{}",
                    pos, in1, in2, pos_out
                );
                intcode[pos_out] = in1 + in2;
                pos + 4
            }
            2 => {
                let in1 = intcode[intcode[pos + 1]];
                let in2 = intcode[intcode[pos + 2]];
                let pos_out = intcode[pos + 3];
                println!(
                    "mult[{}]: value:{} * value:{} -> pos:{}",
                    pos, in1, in2, pos_out
                );
                intcode[pos_out] = in1 * in2;
                pos + 4
            }
            99 => {
                println!("end program");
                pos
            }
            _ => {
                println!("unknown code");
                pos + 1
            }
        }
    }
    println!("memory dump: {:?}\n\nresult: {}", intcode, intcode[0]);
}
fn main() {
    run_intcode(&mut vec![1, 0, 0, 0, 99]);
    run_intcode(&mut vec![2, 3, 0, 3, 99]);
    run_intcode(&mut vec![2, 4, 4, 5, 99, 0]);
    run_intcode(&mut vec![1, 1, 1, 4, 99, 5, 6, 0, 99]);
    let mut intcode = vec![
        1, 0, 0, 3, 1, 1, 2, 3, 1, 3, 4, 3, 1, 5, 0, 3, 2, 1, 6, 19, 1, 9, 19, 23, 2, 23, 10, 27,
        1, 27, 5, 31, 1, 31, 6, 35, 1, 6, 35, 39, 2, 39, 13, 43, 1, 9, 43, 47, 2, 9, 47, 51, 1, 51,
        6, 55, 2, 55, 10, 59, 1, 59, 5, 63, 2, 10, 63, 67, 2, 9, 67, 71, 1, 71, 5, 75, 2, 10, 75,
        79, 1, 79, 6, 83, 2, 10, 83, 87, 1, 5, 87, 91, 2, 9, 91, 95, 1, 95, 5, 99, 1, 99, 2, 103,
        1, 103, 13, 0, 99, 2, 14, 0, 0,
    ];
    intcode[1] = 12;
    intcode[2] = 2;
    run_intcode(&mut intcode);
}