快读快写 2021.5.23

#include<bits/stdc++.h>
using namespace std;
inline int read()
{
    int x=0,f=1;  char ch=getchar();
    while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘) f=-1; ch=getchar();}
    while(ch>=‘0‘&&ch<=‘9‘){ x=(x<<1)+(x<<3)+(ch^48); ch=getchar();}
    return x*f;
}
void write(int x)
{
    if(x<0) putchar(‘-‘),x=-x;
    if(x>9) write(x/10);
    putchar(x%10+‘0‘);
}
int main()
{
    int n;
    n=read();
    write(n);
    return 0;
}