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 long sum =0;
for(int i=1; i<=10; i++){
sum += (pow(10,i)-1);
}
cout<< sum;
return 0;
}
