快速读入模板

inline int read()
{
    char ch = getchar();
    int x = 0, f = 1;
    while(ch > '9' || ch < '0')
    {
        if(ch == '-')
            f = -1;
        ch = getchar();
    }
    while(ch >= '0' && ch <= '9')
    {
        x = x * 10 + ch - '0';
        ch = getchar();
    }
    return x * f;
}