解题思路:
注意事项:
参考代码:
import java.util.*;
public class z1145 {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
double t = 1;
double sum = 0;
for (double i = 1; i <= n; i++) {
if (i == 1)
sum = 100;
else {
sum = sum + 100 / t;
t = 2 * t;
}
}
System.out.printf("%.4f", sum);
}
}
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