【模板】快读快输
updated on 2023.9.13
namespace RobinChen{
char buf[1<<20],*p1=buf,*p2=buf;
int gc(){
if(p1==p2) p2=(p1=buf)+fread(buf,1,1<<20,stdin);
return p1==p2?EOF:*p1++;
}
template<class T> T read(){
T x=0; char ch=gc(); int flg=1;
for(;ch<'0'||'9'<ch;ch=gc()) if(ch=='-') flg=-1;
for(;'0'<=ch&&ch<='9';ch=gc()) x=x*10+ch-'0';
return x*flg;
}
};
using RobinChen::read;
namespace Crxis{
char buf[1<<20],*p1=buf,*p2=buf+(1<<20);
void flush(){fwrite(buf,1,p1-buf,stdout),p1=buf;}
void pc(char ch){
if(p1==p2) flush();
*p1++=ch;
}
void write(int x){
if(x==0) return pc('0'),void();
if(x<0) pc('-'),x=-x;
static int stk[40];
int top=0;
while(x) stk[++top]=x%10,x/=10;
for(int i=top;i>=1;i--) pc(stk[i]+'0');
}
};
using Crxis::pc;
using Crxis::write;
using Crxis::flush;
posted on 2021-02-16 22:40:01 | under 学术 | source
警示后人：不要试图去写过于复杂的快读快输，卡常/CE 会让你崩溃
一行式：
const char endl='\n';namespace IO{const int n=1<<20;char i[n],o[n],*ip=i,*iq=i,*op=o,*oq=o+n;char G(){return ip==iq&&(iq=(ip=i)+std::fread(i,1,n,stdin)),ip==iq?EOF:*ip++;}void P(char c){op==oq&&std::fwrite(op=o,1,n,stdout),*op++=c;}bool D(char c){return '0'<=c&&c<='9';}struct F{~F(){std::fwrite(o,1,op-o,stdout);}}f;struct R{template<class T>R operator>>(T&x){x=0;int f=0,c=G();for(;!D(c);c=G())f|=c=='-';for(;D(c);c=G())x=x*10-'0'+c;if(f)x=-x;return*this;}}cin;struct W{template<class T>W operator<<(T x){if(x<0)x=-x,P('-');if(x>9)*this<<x/10;P(x%10+'0');return*this;}}cout;template<>W W::operator<<(char c){P(c);return*this;}};using IO::cin;using IO::cout;
//
重载运算符式：https://www.luogu.com.cn/paste/7clcx6a0
#include <cstdio>
//#define DEBUG
#define NO_IOSTREAM
namespace FAST_IO{
static const int
_MAX_IO_SIZE=1<<15,
_MAX_NUMBER_LENGTH=20;
class IO_chars{
private: char _I_buf[_MAX_IO_SIZE],*_I_p1,*_I_p2;
private: char _O_buf[_MAX_IO_SIZE],*_O_p1,*_O_p2;
#ifndef DEBUG
public: inline IO_chars():_I_p1(_I_buf),_I_p2(_I_buf),_O_p1(_O_buf),_O_p2(_O_buf+_MAX_IO_SIZE){}
public: inline ~IO_chars(){std::fwrite(_O_buf,1,_O_p1-_O_buf,stdout);}
public: inline char getchar(){
if(_I_p1==_I_p2){
_I_p1=_I_buf;
_I_p2=_I_p1+std::fread(_I_buf,1,_MAX_IO_SIZE,stdin);
}
return _I_p1==_I_p2?EOF:*_I_p1++;
}
public:inline void putchar(const char &_O_ch){
if(_O_p1==_O_p2){
std::fwrite(_O_buf,1,_MAX_IO_SIZE,stdout);
_O_p1=_O_buf;
}
*_O_p1++=_O_ch;
}
#else
public: inline char getchar(){return std::getchar();}
public:inline void putchar(const char &_O_ch){std::putchar(_O_ch);}
#endif
} ioch;
class IO{
public: inline bool isdigit(const char &ch){return '0'<=ch&&ch<='9';}
public: inline bool isblank(const char &ch){return ch<=32||ch==127;}
#define def(type) \
public: inline IO operator>>(type &x){\
bool f;char ch=ioch.getchar();\
for(f=0;!isdigit(ch);f|=(ch=='-'),ch=ioch.getchar())\
if(ch==EOF) throw "Runtime error: No any numbers to read.";\
for(x=0; isdigit(ch);ch=ioch.getchar())\
x=(x<<3)+(x<<1)+(ch^'0');\
return (f)&&(x=~x+1),*this;\
}
def(short) def(int) def(unsigned int)
def(long long) def(unsigned long long)
#undef def
#define def(type) \
public: inline IO operator<<(type x){\
short stk[_MAX_NUMBER_LENGTH],cnt=0;\
if(x<0) x=~x+1,ioch.putchar('-');\
do stk[cnt++]=x%10; while(x/=10);\
do ioch.putchar(stk[--cnt]+'0'); while(cnt);\
return *this;\
}
def(short) def(int) def(unsigned int)
def(long long) def(unsigned long long)
#undef def
public: inline IO operator>>(char &a){
char ch=ioch.getchar();
for(; isblank(ch);ch=ioch.getchar())
if(ch==EOF) return a=ch,*this;
return a=ch,*this;
}
public: inline IO operator<<(const char &a){
ioch.putchar(a);
return *this;
}
public: inline IO operator>>(char *a){
char ch=ioch.getchar();
for(; isblank(ch);ch=ioch.getchar())
if(ch==EOF) throw "Runtime error: No any chars to read.";
for(;!isblank(ch);ch=ioch.getchar())
*a++=ch;
return *a='\0',*this;
}
public: inline IO operator<<(const char *a){
for(;*a;a++)
ioch.putchar(*a);
return *this;
}
} io;
#ifdef DEBUG
#undef DEBUG
#endif
#ifdef NO_IOSTREAM
#define cin io
#define cout io
#define endl '\n'
#endif
}
using namespace FAST_IO;
int main(){
int a,b;
cin>>a>>b;
cout<<a+b;
return 0;
}
函数式：
#include <cstdio>
namespace FAST_IO{
//#define DEBUG
class IO_chars{
private:
static const int _MAX_IO_SIZE=1<<20;
char _I_buf[_MAX_IO_SIZE],*_I_p1,*_I_p2;
char _O_buf[_MAX_IO_SIZE],*_O_p1,*_O_p2;
public:
#ifndef DEBUG
IO_chars():_I_p1(_I_buf),_I_p2(_I_buf),_O_p1(_O_buf),_O_p2(_O_buf+_MAX_IO_SIZE){}
~IO_chars(){std::fwrite(_O_buf,1,_O_p1-_O_buf,stdout);}
#endif
char getchar(){
#ifdef DEBUG
return std::getchar();
#endif
if(_I_p1==_I_p2){
_I_p1=_I_buf;
_I_p2=_I_p1+std::fread(_I_buf,1,_MAX_IO_SIZE,stdin);
}
return _I_p1==_I_p2?EOF:*_I_p1++;
}
void putchar(const char &_O_ch){
#ifdef DEBUG
std::putchar(_O_ch);
return ;
#endif
if(_O_p1==_O_p2){
std::fwrite(_O_buf,1,_MAX_IO_SIZE,stdout);
_O_p1=_O_buf;
}
*_O_p1++=_O_ch;
}
} IOER;
class IO{
private:
static const int _MAX_LEN=20,_ZERO=(int)'0';
int stack[_MAX_LEN];
public:
bool isdigit(const char &ch){return '0'<=ch&&ch<='9';}
bool isblank(const char &ch){return ch==' '||ch==EOF||ch=='\n'||ch=='\r'||ch=='\t';}
template<typename T>
inline void read(T &x){
#ifdef DEBUG
std::scanf("%d",&x);
return ;
#endif
x=0;int f=0;char ch=IOER.getchar();
for(;!isdigit(ch);f|=(ch=='-'),ch=IOER.getchar())
if(ch==EOF) return ;
for(; isdigit(ch);ch=IOER.getchar())
x=(x<<3)+(x<<1)+(ch^_ZERO);
if(f) x=(~x+1);
}
template<typename T>
inline void write(const T &x){
#ifdef DEBUG
std::printf("%d",x);
return ;
#endif
int num=x,top=0;
if(num<0) num=(~num+1),IOER.putchar('-');
do stack[top++]=num%10,num/=10; while(num);
while(top) IOER.putchar(stack[--top]+_ZERO);
}
inline void readstr(char *a){
#ifdef DEBUG
std::scanf("%s",a);
return ;
#endif
int i=0;char ch=IOER.getchar();
for(; isblank(ch);ch=IOER.getchar())
if(ch==EOF) return ;
for(;!isblank(ch);ch=IOER.getchar())
a[i++]=ch;
a[i]='\0';
}
inline void gets(char *a){
#ifdef DEBUG
std::scanf("%[^\n\r]",a);
//不知道这种方式读入的字符串有没有\0，没有那就换成std::gets吧
return ;
#endif
int i=0;char ch=IOER.getchar();
for(; (ch==EOF||ch=='\n'||ch=='\r');ch=IOER.getchar())
if(ch==EOF) return ;
for(;!(ch==EOF||ch=='\n'||ch=='\r');ch=IOER.getchar())
a[i++]=ch;
a[i]='\0';
}
inline void puts(const char *a){
#ifdef DEBUG
std::puts(a);
return ;
#endif
for(int i=0;a[i]!='\0';i++)
IOER.putchar(a[i]);
IOER.putchar('\n');
}
} io;
//#undef DEBUG
}
using FAST_IO::io;
int x;
char a[10010];
int main(){
io.read(x);
io.write(x);
io.puts("");
io.gets(a);
io.puts(a);
return 0;
}
本文来自博客园，作者：caijianhong，转载请注明原文链接：https://www.cnblogs.com/caijianhong/p/template-fastio.html
