C++ 编程实现：求解 1!+2!+3!+...+N! 的和

```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; // 计算 i! sum += factorial; // 累加到总和中 } cout << sum << endl; return 0; } ``` ######[AI问答 | 98点数解答 | 2025-12-06 14:50:19]