dsalgo 0.3.10

A package for Datastructures and Algorithms.
Documentation 
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pub fn array_rank(mut a: Vec<usize>) -> Vec<usize> {
    let n = a.len();

    let mut m = *a.iter().min().unwrap();

    for i in 0..n {
        a[i] -= m;
    }

    m = *a.iter().max().unwrap();

    let mut arg = vec![0; m + 2];

    for &x in a.iter() {
        arg[x + 1] += 1;
    }

    for i in 0..m + 1 {
        arg[i + 1] += arg[i];
    }

    let mut res = vec![0; n];

    for i in 0..n {
        res[i] = arg[a[i]];

        arg[a[i]] += 1;
    }

    res
}

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

    fn test() {
        let a = vec![7, 2, 1, 3, 2, 1];

        assert_eq!(array_rank(a), [5, 2, 0, 4, 3, 1]);
    }
}