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 num = 9;
long long sum;
for(int i = 0; i < 10; i++)
{
if(i == 0)
{
sum = num;
}
else
{
num = num * 10 + 9;
sum += num;
}
}
cout << sum << endl;
return 0;
}
查看8道真题和解析