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 long int sum = 0;
long long int array_num = 9999999999;
for (long int j = 1; j <= 1000000000; j *= 10) {
sum += array_num / j;
}
cout << sum;
return 0;
}
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