题解 | #规律数列求和#
规律数列求和
https://www.nowcoder.com/practice/e05d1c142b3d4898be7183289a00ce5f
#include <cmath>
#include <iostream>
using namespace std;
int main() {
long sum = 0;
for (int i = 1; i<=10 ; i++) {
sum+=pow(10,i)-1;
}
cout<<sum;
return 0;
}
