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