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() {
int n=0;long long an=0;long long sn=0;
for(n=1;n<=10;n++)
{an=an*10+9;
sn=sn+an;}
cout<<sn<<endl;
return 0;
}
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