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;
for(long long j=10;j<=10000000000;j*=10){
sum+=(j-1);
}
cout<<sum;
return 0;
}
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