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package Course_Codes;
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import java.util.Scanner;
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//判断一个整数n是否为2^x
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public class _2的幂的判断 {
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public static void main(String[] args) {
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Scanner sc=new Scanner(System.in);
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while(sc.hasNext()){
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int n=sc.nextInt();
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System.out.println((n&(n-1))==0?"YES":"NO");
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}
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}
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}
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