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/// if >= v1.60.0, a.abs_diff(b) is available. /// https://doc.rust-lang.org/std/primitive.u64.html#method.abs_diff pub fn abs_diff( a: u64, b: u64, ) -> u64 { if a >= b { a - b } else { b - a } } #[cfg(test)] mod tests { #[test] fn test() {} }