题解 | #规律数列求和#
规律数列求和
https://www.nowcoder.com/practice/e05d1c142b3d4898be7183289a00ce5f
#include <iostream>
#include <cmath>
using namespace std;
int main() {
long long sum = 0;
for(long long i = 0; i<=9; i++){
long long factor = 9.999999999*pow(10,i);
sum = sum + factor;
}
cout<<sum;
return 0;
}
准备好用于进位的999999
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