euler74.rs

pub fn solve(max:u32, terms:usize) -> usize {
    (1..max)
        .filter(|&i| {
            let mut v = Vec::with_capacity(terms);
            let mut start = i;
            let mut j = 0;

            while !v.contains(&start) {
                v.push(start);
                start = digit_factorial_sum(start);
                j += 1
            }

            return j == terms
        })
        .count()
}

solve(1000000, 60)