#include<bits/stdc++.h>
using namespace std;
const int N=1e3+10;
int a[N],n,cnt,cnt1;
int main()
{
	cin >> n;
	for(int i=1;i<=n;i++)cin >> a[i];
	for(int i=1;i<=n;i++)
	{
		if(i%2)cnt+=a[i];
		else cnt1+=a[i];
	}
	cout << cnt << endl << cnt1 << endl;
	int ans= fabs(cnt-cnt1);
	cout << ans << endl;
	return 0;
}
//老登布置的作业系列

#include<iostream>
using namespace std;
int n,x,sum,num;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>x;
        if(i%2==0) num+=x;
        else sum+=x;
    }
    cout<<sum<<endl<<num<<endl<<abs(sum-num);
    return 0;
}

# include <bits/stdc++.h>

using namespace std;
int x,y,a,n;string s;

int main(){
	cin>>n;
	for(int i = 1;i<=n;i++){
		cin>>a;
		x+=(i&1)*a;
		y+=(1-(i&1))*a;
	}
	cout<<x<<'\n'<<y<<'\n'<<abs(x-y);
	return 0;
}

这题表达有问题