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 sum=0;
long base=9;
for(int i=0;i<10;i++){
sum+=base;
base=base*10+9;
}
System.out.println(sum);
}
}
