dsalgo 0.3.10

A package for Datastructures and Algorithms.
Documentation 
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pub fn phi(mut n: i64) -> i64 {
    let mut c = n;

    for i in 2..n {
        if i * i > n {
            break;
        }

        if n % i != 0 {
            continue;
        }

        c -= c / i;

        while n % i == 0 {
            n /= i;
        }
    }

    if n > 1 {
        c -= c / n;
    }

    c
}

#[cfg(test)]

mod tests {

    use super::*;

    #[test]

    fn test() {
        let ans = [
            1, 1, 2, 2, 4, 2, 6, 4, 6, 4, 10, 4, 12, 6, 8, 8, 16, 6, 18, 8, 12,
            10, 22, 8, 20, 12, 18, 12, 28, 8, 30, 16, 20, 16, 24, 12, 36, 18,
            24, 16, 40, 12, 42, 20, 24, 22, 46, 16, 42, 20, 32, 24, 52, 18, 40,
            24, 36, 28, 58, 16, 60, 30, 36, 32, 48, 20, 66, 32, 44,
        ];

        for i in 0..ans.len() {
            assert_eq!(phi(i as i64 + 1), ans[i]);
        }
    }
}