IO 优化

转自 BlackJack_

#define fastcall __attribute__((optimize("-O3")))
#define IL __inline__ __attribute__((always_inline))
 
#ifdef ONLINE_JUDGE
char *TT,*mo,but[(1<<15)+2];
#define getchar() ((TT==mo&&(mo=(TT=but)+fread(but,1,1<<15,stdin)),TT==mo)?0:*TT++)
#endif
fastcall IL int read()
{
    int x=0,ch=0;
    while(ch<'0'||ch>'9')ch=getchar();
    while(ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
    return x;
}
fastcall void print(int x)
{if(x<0)putchar('-'),x=-x;if(x>=10)print(x/10);putchar(x%10+'0');}

#include <cstdio>
 
using namespace std;
 
namespace io {
    const int SIZE = (1 << 21) + 1;
    char ibuf[SIZE], *iS, *iT, obuf[SIZE], *oS = obuf, *oT = oS + SIZE - 1, c, qu[55]; int f, qr;
    // getchar
    #define gc() (iS == iT ? (iT = (iS = ibuf) + fread (ibuf, 1, SIZE, stdin), (iS == iT ? EOF : *iS ++)) : *iS ++)
    // print the remaining part
    inline void flush () {
        fwrite (obuf, 1, oS - obuf, stdout);
        oS = obuf;
    }
    // putchar
    inline void putc (char x) {
        *oS ++ = x;
        if (oS == oT) flush ();
    }
    // input a signed integer
    template <class I>
    inline void gi (I &x) {
        for (f = 1, c = gc(); c < '0' || c > '9'; c = gc()) if (c == '-') f = -1;
        for (x = 0; c <= '9' && c >= '0'; c = gc()) x = x * 10 + (c & 15); x *= f;
    }
    // print a signed integer
    template <class I>
    inline void print (I &x) {
        if (!x) putc ('0'); if (x < 0) putc ('-'), x = -x;
        while (x) qu[++ qr] = x % 10 + '0',  x /= 10;
        while (qr) putc (qu[qr --]);
    }
}
using io :: gi;
using io :: putc;
using io :: print;
 
int v;
 
int main () {
    gi (v);
    print (v);
    putc ('\n');
    io :: flush ();
}