A20 双指针 [ARC098B] Xor Sum 2 A20 双指针 [ARC098B] Xor Sum 2

#include<bits/stdc++.h>
using namespace std;
const int N = 2e5 + 10;
int  a[N];
signed main()
{
	int n;scanf("%d", &n);
	for(int i = 1; i <= n; i++)scanf("%d", &a[i]);
	long long ans=0;
	for(int i = 1, j = 0,sum=0; i <= n; i++)
	{
		while(j + 1 <= n && sum + a[j + 1] == (sum ^ a[j + 1]))sum += a[j+1],j++;
		ans += j - i + 1;  
		sum -= a[i];
	}
	printf("%lld\n", ans);
	return 0;
}