题解 | #数列求和#
数列求和
https://www.nowcoder.com/practice/6893484c04c24bfca1f606b1823a468d
import static java.lang.Math.pow;
public class Main {
public static void main(String[] args) {
//write your code here........
long arr[] = new long[10];
long sum = 0;
arr[0] = 9;
for (int i = 1; i < 10 ; i++) {
arr[i] = (long) (arr[i - 1] + 9 * (pow(10, i)));
sum += arr[i];
}
System.out.println(arr[0] + sum);
}
}
查看4道真题和解析
你只是陷入了短暂的低谷，你也一直有退路