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各位大神求解,为什么会RE!import java.math.BigDecimal;
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
int n;
Scanner sc = new Scanner(System.in);
while(true){
n = sc.nextInt();
if(n%2==0){
System.out.println((new BigDecimal(2).pow(n+1).add(new BigDecimal(1))).divide(new BigDecimal(3)));
}else{
System.out.println((new BigDecimal(2).pow(n+1).subtract(new BigDecimal(1))).divide(new BigDecimal(3)));
}
}
}
}
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