自己用vs编译通过，样例也过了 ，但是提交洛谷编译失败

#include<iostream>
#include<vector>
using namespace std;
typedef vector<int> VI;
VI mul(VI &A,int b) {//高精度乘法
	int t = 0;
	VI C;
	for (int i = 0; i < A.size()||t; i++) {
		if (i < A.size()) t += A[i] * b;
		C.push_back(t % 10);
		t /= 10;
	}
	while (C.size() > 1 && C.back() == 0) C.pop_back();
	return C;
}
VI add(VI &A, VI &B) {//高精度加法
	if (A.size() < B.size()) return add(B, A);
	int t = 0;
	VI C;
	for (int i = 0; i < A.size(); i++) {
		t += A[i];
		if (i < B.size()) t += B[i];
		C.push_back(t % 10);
		t /= 10;
	}
	if (t) C.push_back(t);
	return C;
}
VI Factorial(int n) {//高精度阶乘
	VI C;
	C.push_back(1);
	for (int i = 2; i <=n; i++) {
		C = mul(C, i);
	}
	return C;
}
int main() {
	int n;
	cin >> n;
	VI C;
	C.push_back(1);
	for (int i = 2; i <=n; i++) {
		C = add(C, Factorial(i));
	}
	for (int i = C.size() - 1; i >= 0; i--) cout << C[i];
	return 0;
}