直接上代码保存一下:

#include<cctype>
#include<cstdio>
#include<cstring>
#define ll long long int
using namespace std;
//快读
inline ll read(){
ll s=0,w=1;
char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
return s*w;
}
//快写
inline void out(ll a)
{
if(a>=10)out(a/10);
putchar(a%10+'0');
}
int main()
{
ll n;
n=read();
out(n);
return 0;
}