题解 | 规律数列求和
#include <iostream>
using namespace std;
int main() {
// write your code here......
long long int sum = 0, mul = 1, total_sum = 0;
for (int i = 1; i <= 10; i++){
mul = 1;
for(int j = 1; j <= i; j++){
mul *= 10;
}
sum += mul / 10;
total_sum += sum;
}
cout << total_sum * 9 << endl;
return 0;
}
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