C++ :

#include<bits/stdc++.h>
using namespace std;
int n,ans,a[200005];
long long sum1[200005],sum2[200005];
int main(){
    cin>>n;
    for(int i=1;i<=n;i++)
    {
    	cin>>a[i];
    	if(i%2==1)
		{
			sum1[i]=sum1[i-1]+a[i];
			sum2[i]=sum2[i-1];
		}
		else
		{
			sum2[i]=sum2[i-1]+a[i];
			sum1[i]=sum1[i-1];
		}
	}
	for(int i=1;i<=n;i++)
	{
		if(i%2==1)
		{
			if(sum1[i-1]+(sum2[n]-sum2[i]) == sum2[i]+(sum1[n]-sum1[i]))
				ans++;
		}
		else
		{
			if(sum1[i]+(sum2[n]-sum2[i+1]) == sum2[i-1]+(sum1[n]-sum1[i]))
				ans++;
		}
	}
	cout<<ans;
    return 0;
}