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//INCOMPLETE
struct Solution;
impl Solution {
pub fn is_power_of_four(num: i32) -> bool {
if num < 0 {
return false;
}
let (ans, pos, ones) = (0, 1, 0);
while num {
if num & 1 {
ans += 1;
ones = pos;
}
num >>= 1;
pos += 1;
}
ans == 1 && ones & 1
}
}
fn main() {
print!("{}", Solution::is_power_of_four(16));
}
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