Function main::rank_count_greater

pub fn rank_count_greater<T: PartialOrd + Clone>(vector: &Vec<T>) -> Vec<usize>

vector.rank() borrows a generic vector and returns a usize vector list of the count of greater items for each item. A rank system described by Wassily Hoeffding in 1947 that's like the olympics, but with a zeroth place instead of gold.
the intended us for rank() is nonparametric statistics.