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 sum = 0;
long num = 0;
long i;
for (i = 1; i <= 10; i++) {
num = num * 10 + 9;
sum += num;
}
cout << sum << endl;
return 0;
}
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