新手这样写简单易懂

#include<bits/stdc++.h>
using namespace std;
#define dIO_USE_BUFFER 
struct IO{
#ifdef dIO_USE_BUFFER
	const static int BUFSIZE=1<<20;
	char ibuf[BUFSIZE], obuf[BUFSIZE], *p1, *p2, *pp;
	inline int getchar(){return(p1 == p2&&(p2=(p1=ibuf)+fread(ibuf,1,BUFSIZE,stdin),p1==p2)?EOF:*p1++);}
	inline int putchar(char x){return((pp-obuf==BUFSIZE&&(fwrite(obuf,1,BUFSIZE,stdout),pp=obuf)),*pp=x,pp++),x;}
	IO(){p1=p2=ibuf,pp=obuf;}
	~IO(){fwrite(obuf,1,pp-obuf,stdout),pp=obuf,fflush(stdout);}
#else
	int (*getchar)()=&::getchar,(*putchar)(int)=&::putchar;
	inline IO &flush(){return fflush(stdout),*this;}
#endif
	template<typename Tp,typename enable_if<is_integral<Tp>::value>::type * =nullptr>
	inline void read(Tp &s){
		int f=1,ch=getchar();s=0;
		while(!isdigit(ch))f=(ch=='-'?-1:1),ch=getchar();
		while(ch == '0')ch = getchar();
		while(isdigit(ch))s=s*10+(ch^48),ch=getchar();
		s*=f;
	}
	template<typename Tp,typename enable_if<is_integral<Tp>::value>::type * =nullptr>
	inline void write(Tp x){
		if(x<0)putchar('-'),x=-x;
		static char sta[41];
		int top=0;
		do sta[top++]=x%10^48,x/=10;while(x);
		while(top)putchar(sta[--top]);
	}
	template<typename Tp>
	inline void writeln(const Tp &x){write(x);putchar('\n');}
	template<typename Tp>
	inline void writeSp(const Tp &x){write(x);putchar(' ');}
}io;
int main(){
	int a,b;
	io.read(a),io.read(b);
	io.write(a+b);
    return 0;
}