安利一个好用的读入优化！

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 1 #include <bits/stdc++.h>
 2 
 3 using namespace std;
 4 
 5 namespace io {
 6     const int SIZE = (1 << 21) + 1;
 7     char ibuf[SIZE], *iS, *iT, obuf[SIZE], *oS = obuf, *oT = oS + SIZE - 1, c, qu[55]; int f, qr;
 8     // getchar
 9     #define gc() (iS == iT ? (iT = (iS = ibuf) + fread (ibuf, 1, SIZE, stdin), (iS == iT ? EOF : *iS ++)) : *iS ++)
10     // print the remaining part
11     inline void flush () {
12         fwrite (obuf, 1, oS - obuf, stdout);
13         oS = obuf;
14     }
15     // putchar
16     inline void putc (char x) {
17         *oS ++ = x;
18         if (oS == oT) flush ();
19     }
20     // input a signed integer
21     template <class I>
22     inline void gi (I &x) {
23         for (f = 1, c = gc(); c < '0' || c > '9'; c = gc()) if (c == '-') f = -1;
24         for (x = 0; c <= '9' && c >= '0'; c = gc()) x = x * 10 + (c & 15); x *= f;
25     }
26     // print a signed integer
27     template <class I>
28     inline void print (I &x) {
29         if (!x) putc ('0'); if (x < 0) putc ('-'), x = -x;
30         while (x) qu[++ qr] = x % 10 + '0',  x /= 10;
31         while (qr) putc (qu[qr --]);
32     }
33 }
34 using io :: gi;
35 using io :: putc;
36 using io :: print;
37 
38 int v;
39 
40 int main () {
41     gi (v);
42     print (v);
43     putc ('\n');
44     io :: flush ();
45 }
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posted on 2018-04-20 23:38 ^m 阅读(125) 评论(0) 编辑收藏举报