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use std::ops::*;
pub fn power<T>(
x: T,
n: u64,
) -> T
where
T: Clone + MulAssign,
{
assert!(n > 0);
if n == 1 {
return x;
}
let mut y = power(x.clone(), n >> 1);
y *= y.clone();
if n & 1 == 1 {
y *= x;
}
y
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
assert_eq!(power(2, 10), 1024);
}
}