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playground.rs

fn rotate(direction: &mut Vec<i32>, turn: &str){
    let x = direction[0];
    let y = direction[1];
    if turn == "L" {
        direction[1] = x;
        direction[0] = -y;
    } else {
        direction[1] = -x;
        direction[0] = y;
    }
}

fn doit () -> Result<i32, std::num::ParseIntError>{
    let x = "L1, L5, R1, R3, L4, L5, R5, R1, L2, L2, L3, R4, L2, R3, R1, L2, R5, R3, L4, R4, L3, R3, R3, L2, R1, L3, R2, L1, R4, L2, R4, L4, R5, L3, R1, R1, L1, L3, L2, R1, R3, R2, L1, R4, L4, R2, L189, L4, R5, R3, L1, R47, R4, R1, R3, L3, L3, L2, R70, L1, R4, R185, R5, L4, L5, R4, L1, L4, R5, L3, R2, R3, L5, L3, R5, L1, R5, L4, R1, R2, L2, L5, L2, R4, L3, R5, R1, L5, L4, L3, R4, L3, L4, L1, L5, L5, R5, L5, L2, L1, L2, L4, L1, L2, R3, R1, R1, L2, L5, R2, L3, L5, L4, L2, L1, L2, R3, L1, L4, R3, R3, L2, R5, L1, L3, L3, L3, L5, R5, R1, R2, L3, L2, R4, R1, R1, R3, R4, R3, L3, R3, L5, R2, L2, R4, R5, L4, L3, L1, L5, L1, R1, R2, L1, R3, R4, R5, R2, R3, L2, L1, L5";
    let instructions = x.split(", ");
    let mut direction = vec![1, 0];
    let mut position = vec![0, 0];
    
    for instruction in instructions {
        let (turn, distance_str) = instruction.split_at(1);
        let distance = try!(distance_str.parse::<i32>());
        rotate(&mut direction, turn);
        position[0] += direction[0] * distance;
        position[1] += direction[1] * distance;
    }
    return Ok(position[0].abs() + position[1].abs())
}

fn main (){
    match doit() {
        Ok(v) => println!("distance = {:?}", v),
        Err(e) => println!("failed: {:?}", e),
    }
}