C++: FastIO

fastio.cpp

#define FI(n) FastIO::read(n)
namespace FastIO
{
const int SIZE = 1 << 16;
char buf[SIZE], obuf[SIZE], str[60];
int bi = SIZE, bn = SIZE, opt;
int read(char *s)
{
    while (bn)
    {
        for (; bi < bn && buf[bi] <= ' '; bi++)
            ;
        if (bi < bn)
            break;
        bn = fread(buf, 1, SIZE, stdin);
        bi = 0;
    }
    int sn = 0;
    while (bn)
    {
        for (; bi < bn && buf[bi] > ' '; bi++)
            s[sn++] = buf[bi];
        if (bi < bn)
            break;
        bn = fread(buf, 1, SIZE, stdin);
        bi = 0;
    }
    s[sn] = 0;
    return sn;
}

bool read(int &x)
{
    int n = read(str), bf;
    if (!n)
        return 0;
    int i = 0;
    if (str[i] == '-')
        bf = -1, i++;
    else
        bf = 1;
    for (x = 0; i < n; i++)
        x = x * 10 + str[i] - '0';
    if (bf < 0)
        x = -x;
    return 1;
}
}; // namespace  FastIO