居然没看出来可以用max函数来做......

我的代码：

#include<bits/stdc++.h>
using namespace std;
long long n=3,a[1005];
bool cmp(long long x,long long y){return x>y;}
long long read(){
	long long ret=0,f=1;char ch=getchar();
	while(!isdigit(ch)){if(ch=='-')f=-f;ch=getchar();}
	while(isdigit(ch))ret=(ret<<1)+(ret<<3)+(ch&15),ch=getchar();
	return ret*f;
}
void write(long long x){
	if(x<0)x=-x,putchar('-');
	if(x>9)write(x/10);
	putchar(x%10+'0');
}
int main(){
	for(int i=1;i<=n;i++)a[i]=read();
	sort(a+1,a+1+n,cmp);
	write(a[1]);
	return 0;
}