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() {
long i=0;
for (long m=9999999999; m>0; ) {
i+=m;
m=m/10;
}
cout<<i<<endl;
return 0;
}
