fastIO

不考虑内存浪费的fastIO

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 namespace IO
 4 {
 5     const int len=1<<25;
 6     bool flag;
 7     char ch,ibuf[len],wbuf[len];
 8     int il=0,wl=0,g,G[55];
 9     void in(){int x=fread(ibuf,1,len,stdin);}
10     inline void out(){int x=fwrite(wbuf,1,wl,stdout);}
11     inline void gc(char&c){c=ibuf[il++];}
12     template<typename T>void read(T&x)
13     {
14         flag=0;gc(ch);
15         if(ch=='-')flag=1;
16         while(!isdigit(ch)){if(ch=='-')flag=1;gc(ch);}
17         x=ch-'0';gc(ch);
18         while(isdigit(ch)){x=x*10+ch-'0';gc(ch);}
19         x=flag?-x:x;
20     }
21     template<typename T>void write(T x)
22     {
23         if(x<0)wbuf[wl++]='-',x=-x;
24         g=0;
25         do{G[++g]=x%10;x/=10;}while(x);
26         for(int i=g;i>=1;--i)wbuf[wl++]='0'+G[i];
27         wbuf[wl++]='
';
28     }
29 }
30 int main()
31 {
32     ios::sync_with_stdio(false);
33     IO::in();
34     IO::out();
35     return 0;
36 }

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若总共需要读入和输出len个字符，需占用len/1048576*2 Mb的内存。