大佬的几行fastIO

namespace io {
  const int SIZE = 1e6;
  char buff[SIZE];
  char *l = buff, *r = buff;
  void init() {
    l = buff;
    r = l + fread(buff, 1, SIZE, stdin);
  }
  char gc() {
    if (l == r) init();
    if(l==r)return EOF;
      return *(l++);
  }
  void read(int &x) {
    x = 0;
    char ch = gc();
    while(!isdigit(ch)) ch = gc();
    while(isdigit(ch)) x = x * 10 + ch - '0', ch = gc();
  }
}using io::read;

 

#include<iostream>
#include<cctype>
using namespace std;
using std::cin;
using std::cout;
using std::endl;
namespace IN {
    const int MAX_INPUT = 1000000;
    #define getc() (p1 == p2 && (p2 = (p1 = buf) + inbuf -> sgetn(buf, MAX_INPUT), p1 == p2) ? EOF : *p1++)
    char buf[MAX_INPUT], *p1, *p2;
    template <typename T> inline bool redi(T &x) {
        static std::streambuf *inbuf = cin.rdbuf();
        x = 0;
        register int f = 0, flag = false;
        register char ch = getc();
        while (!std::isdigit(ch)) {
            if (ch == '-') f = 1;
        ch = getc();
        }
        if (std::isdigit(ch)) x = x * 10 + ch - '0', ch = getc(),flag = true;
        while (std::isdigit(ch)) {
            x = x * 10 + ch - 48;
            ch = getc();
        }
        x = f ? -x : x ;
        return flag;
    }
    template <typename T,typename ...Args> inline bool redi(T& a,Args& ...args) {
       return redi(a) && redi(args...);
    }
    #undef getc
}

namespace OUT {
    template <typename T> inline void put(T x) {
        static std::streambuf *outbuf = cout.rdbuf();
        static char stack[21];
        static int top = 0;
        if (x < 0) {
            outbuf -> sputc('-');
            x=-x;
        }
        if (!x) {
            outbuf -> sputc('0');
            outbuf -> sputc('\n');
            return;
        }
        while (x) {
            stack[++top] = x % 10 + '0';
            x /= 10;
        }
        while (top) {
            outbuf -> sputc(stack[top]);
            -- top;
        }
        outbuf -> sputc('\n');
    }
    inline void putc (const char ch) {
        static std::streambuf *outbuf = cout.rdbuf();
        outbuf -> sputc(ch);
    }
    template <typename T> inline void put(const char ch,T x)
    {
        static std::streambuf *outbuf = cout.rdbuf();
        static char stack[21];
        static int top = 0;
        if (x < 0) {
            outbuf -> sputc('-');
            x=-x;
        }
        if (!x) {
            outbuf -> sputc('0');
            outbuf -> sputc(ch);
            return;
        }
        while (x) {
            stack[++top] = x % 10 + '0';
            x /= 10;
        }
        while (top) {
            outbuf -> sputc(stack[top]);
            --top;
        }
        outbuf -> sputc(ch);
    }
    template<typename T,typename ...Args> inline void put(T a,Args ...args) {
        put(a);put(args...);
    }
    template<typename T,typename ...Args> inline void put(const char ch,T a,Args ...args) {
        put(ch,a);put(ch,args...);
    }
}
using IN::redi;
using OUT::put;
using OUT::putc;
int main(int argc, char const *argv[])
{
    freopen("testdata.in","r",stdin);
    freopen("testdata.out","w",stdout);
    std::ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int a,b;
    redi(a,b);
    put(' ',a,b);
    putc('\n');
    put('\n',a,b,a+b,a*b);
    fclose(stdin);fclose(stdout);
    return 0;
}