快读快写文件模版（旧博搬运）

#include <cstdio>
#include <iostream>
using namespace std;
int a;
int read(){
	int f=1,ans=0;
	char c=getchar();
	while (c<'0'||c>'9') f=(c=='-')?-1:1,c=getchar();
	while (c>='0'&&c<='9') ans=ans*10+c-'0',c=getchar();
	return ans*f;
}
void write(int b){
	int a=b;
	if (b<0) a=-a,putchar('-');
	if (a==0) return;
	write(a/10);
	putchar(a%10+'0');
}
int main(void){
	freopen("test.in","r",stdin);
	freopen("test.out","w",stdout);
	a=read();
	cerr<<a;
	write(a);
	fclose(stdin);
	fclose(stdout);
	return 0;
}