C++ 实现：计算不大于 n（1 < n < 12）的正整数阶乘之和

```cpp #include <iostream> using namespace std; int main() { int n; cin >> n; long long sum = 0; long long factorial = 1; for (int i = 1; i <= n; i++) { factorial *= i; sum += factorial; } cout << sum << endl; return 0; } ``` ######[AI问答 | 85点数解答 | 2025-11-30 11:03:45]