sumsequence coding dojo

extern mod extra;
extern mod std;

type Substr = (uint, uint);

fn sumsequence (s: &str, start: uint) -> ~[Substr] {
    let mut acc = ~[];
    let mut sum = 0;

    for i in range(start, s.len()) {
        let val = from_str(s.slice(i,i+1)).unwrap();

        if sum == val {
            acc.push((start, i+1));
        }
        sum += val;
        if sum > 9 {
            break;
        }
    }

    acc
}

fn main () {
    //let s = "87456481848451713265785181841515124617521496471297469154148163548464541124";
    let raw_input = std::io::stdin().read_to_str();
    let input = extra::arc::Arc::new(raw_input);
    let mut all_results = ~[];

    for i in range(0, input.get().len()) {
        let clone = input.clone();
        let result = do extra::future::Future::spawn { sumsequence(*clone.get(), i) };
        all_results.push(result);
    }
    for results in all_results.mut_iter() {
        for r in results.get_ref().iter() {
            let &(start, end) = r;
            println(input.get().slice(start, end));
        }
    }
}