求助这快读的问题何在？

template<typename TP>
inline void Read(TP &x) {
    int w = 1; char ch;
    for (ch = getchar(); ch < '0' || ch > '9'; ch = getchar())
        if (ch == '-') w = -1;
    for (; ch >= '0' && ch <= '9'; ch = getchar())
        x = (x << 3) + (x << 1) + (ch ^ 48);
    x *= w;
}

检查出者有奖（就怪了