231. Power of Two
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一直除2
public class Solution {
public boolean isPowerOfTwo(int n) {
if(n==0)return false;
if(n==1)return true;
if(n%2==1)return false;
while(n%2==0){
n=n/2;
}
if(n==1)return true;
else return false;
}
}
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