题解 | #数列求和#
数列求和
https://www.nowcoder.com/practice/6893484c04c24bfca1f606b1823a468d
public class Main {
public static void main(String[] args) {
long ret=0;
long num=0;
for(int i=0;i<=9;i++)
{
ret=ret*10+9;//每次对ret的处理
num+=ret;
}
System.out.println(num);
}
}
