fn main() {
    let testinput = vec![1,9,10,3,2,3,11,0,99,30,40,50];
    runp1(testinput) ;
}



fn runp1(input: Vec<i16>) {

    let mut instruction_list = input.clone();
    let mut index = 0;

    loop {

        let curr_ins = instruction_list[index];

        //println!("curr index: {} ", index );
        //println!("curr list: {:?} ", instruction_list );

        match curr_ins {

            1 => {
                let x = instruction_list[ (instruction_list[index+1] as usize) ];
                let y = instruction_list[ (instruction_list[index+2] as usize) ];
                let dest = instruction_list[ (instruction_list[index+3] as usize) ];
                instruction_list[dest as usize] = x+y;
                index+=4;
            }


            2 => {
                let x = instruction_list[ (instruction_list[index+1] as usize) ];
                let y = instruction_list[ (instruction_list[index+2] as usize) ];
                let dest = instruction_list[ (instruction_list[index+3] as usize) ];
                instruction_list[dest as usize] = x*y;
                index+=4;
            }
            99 => {
                break;
            }
            _ => {
                println!("this shouldnt happen ...");
            }
        }
    }
    println!("{:?}", instruction_list);
}

/*

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_run() {
            let input = [1,9,10,3,2,3,11,0,99,30,40,50];
        runp1

    }
}
*/