C++快读CF模板

#pragma GCC optimize(1)
#pragma GCC optimize(2)
#pragma GCC optimize(3, "Ofast", "inline")
#include 
using namespace std;
#define ll long long
inline int read()
{
    int x = 0, w = 0;
    char ch = getchar();
    while (!isdigit(ch))
    {
        w |= ch == '-';
        ch = getchar();
    }
    while (isdigit(ch))
    {
        x = x * 10 + ch - '0';
        ch = getchar();
    }
    return w ? -x : x;
}
signed main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int n = read();

    return 0;
}