可以从最后一天往前推算,第10天1个,第九天是(1+1)*2个……
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = 1;
for (int i = 1; i < 10; i++) {
n = (n+1)*2;
}
System.out.println(n);
}
}