题解 | 规律数列求和
规律数列求和
https://www.nowcoder.com/practice/e05d1c142b3d4898be7183289a00ce5f
#include <iostream>
using namespace std;
int main() {
// write your code here......
long long sum=0;
long long term=0;
for (int i = 1; i <= 10; i++) {
term = 10 * term + 9;
sum += term;
}
cout << sum << endl;
return 0;
}
