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) {
//write your code here........
long[] arr = new long[10];
long sum =9;
arr[0]=9;
for(int i=1 ;i<10 ;i++){
arr[i] = arr[i-1]+9*(long)(Math.pow(10,i));
sum+=arr[i];
}
System.out.print(sum);
}
}
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