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[]arr=new long[10];
arr[0]=9;
long sum=9;
for(int i=0;i<9;i++){
arr[i+1]=arr[i]*10+9;
sum+=arr[i+1];
}
System.out.println(sum);
}
}
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