非常好代碼，愛(ài)來(lái)自老玩家

#include<bits/stdc++.h>

#define var auto

#define None void

#define def int

#define equal =

#define in >>

#define withargs(v) (v)

#define mul *

#define plus +

#define divideby /

#define smallbracketbegin (

#define smallbracketend )

using namespace std;

None output withargs(auto x);

def main withargs()

{

???var n equal 0;

???cin in n;

???var sum equal 0;

???#ifdef var

???#define print output

???#ifdef print

???#undef print

???#endif

???#ifndef print

???#define print output

???#endif

???#undef var

???#endif

???sum equal smallbracketbegin n plus 1 smallbracketend mul n divideby 2;

???output smallbracketbegin sum smallbracketend;

???exit smallbracketbegin 0 smallbracketend;

}

None print withargs(auto x){

???cout<<x;

}