已A,但疑

#include<bits/stdc++.h>
#define int long long
using namespace std;
template<typename T> void read(T&x){
	int f=1;x=0;char c;
	do{c=getchar();if(c=='-')f=-1;}while(!isdigit(c));
	do{x=x*10+c-'0';c=getchar();}while(isdigit(c));x=x*f;
}
const int N=110;
int n,a[N],x=-1e9-10,y=1e9+10,ans;
signed main(){
	freopen("absmax.in","r",stdin);
	freopen("absmax.out","w",stdout);
	read(n);
	for(int i=1;i<=n;i++)read(a[i]),x=max(x,a[i]),y=min(y,a[i]);
	x=x-y;
	cout<<ceil((x*1.0)/2);
	return 0;
}