题解 | #数列求和#
数列求和
http://www.nowcoder.com/practice/6893484c04c24bfca1f606b1823a468d
public class Main {
public static void main(String[] args) {
//write your code here........
long sum = 0;
long num = 0;
for(int i = 0; i < 10; i++){
num += 9 * Math.pow(10,i);
sum += num;
}
System.out.println(sum);
}
}
