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 num=0;
long sum=0;
// write your code here......
for(int i=0;i<10;i++){
num=num*10;
num+=9;
sum+=num;
}
cout<<sum;
return 0;
}
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