Buggy python submission (verdict: Time Limit Exceeded):
import copy
n = int(input())
ai = [int(i) for i in input().split()]

a2 = [[0 for i in range(20)] for j in range(n)]

#keta = len(format(max(ai),'b'))

for i in range(n):
    tmp = format(ai[i], '0'+str(20)+'b')
    for j in range(20):
        a2[i][j] = int(tmp[j])
    #print()

tmp = a2[0]
flag = True
ans = 0
cnt = 1

for i in range(n-1):
    #print(ans)
    flag = True
    if cnt == 0:
        tmp = a2[i]
        cnt = 1
    while flag == True:
        if i+cnt-1 == n:
            cnt -= 1
            ans += cnt
            flag = False
            break
            #print(i+cnt-1,n,cnt)
            #exit()
        for m in range(i+cnt,n):
            c_tmp = copy.deepcopy(tmp)
            #print(tmp,cnt,m)
            if flag == False:
                break
            for j in range(20):
                if c_tmp[j] + a2[m][j] > 1:
                    flag = False
                    ans += cnt
                    cnt -= 1
                    for j in range(20):
                        tmp[j] -= a2[i][j]
                    break
                else:
                    c_tmp[j] += a2[m][j]
                    #print(c_tmp,tmp,111111,a2[m][j],j)
            if flag == False:
                break
            tmp = c_tmp
            cnt += 1
            if m == n-1:
                #print(m,n-1,i)
                flag = False
                ans += cnt
            if flag == False:
                break
            
print(ans+1)

Fixed submission:
n = int(input())
ai = [int(i) for i in input().split()]

ans = 0
s = 0
x = 0

r = 0
            
for l in range(n):
    while r <= n-1 and s+ai[r] == x^ai[r]:
        s += ai[r]
        x ^= ai[r]
        r += 1
    ans += (r-l)
    
    if l == r:
        r += 1
    else:
        s -= ai[l]
        x ^= ai[l]
        
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import copy
n = int(input())
ai = [int(i) for i in input().split()]

a2 = [[0 for i in range(20)] for j in range(n)]

#keta = len(format(max(ai),'b'))

for i in range(n):
    tmp = format(ai[i], '0'+str(20)+'b')
    for j in range(20):
        a2[i][j] = int(tmp[j])
    #print()

tmp = a2[0]
flag = True
ans = 0
cnt = 1

for i in range(n-1):
    #print(ans)
    flag = True
    if cnt == 0:
        tmp = a2[i]
        cnt = 1
    while flag == True:
        if i+cnt-1 == n:
            cnt -= 1
            ans += cnt
            flag = False
            break
            #print(i+cnt-1,n,cnt)
            #exit()
        for m in range(i+cnt,n):
            c_tmp = copy.deepcopy(tmp)
            #print(tmp,cnt,m)
            if flag == False:
                break
            for j in range(20):
                if c_tmp[j] + a2[m][j] > 1:
                    flag = False
                    ans += cnt
                    cnt -= 1
                    for j in range(20):
                        tmp[j] -= a2[i][j]
                    break
                else:
                    c_tmp[j] += a2[m][j]
                    #print(c_tmp,tmp,111111,a2[m][j],j)
            if flag == False:
                break
            tmp = c_tmp
            cnt += 1
            if m == n-1:
                #print(m,n-1,i)
                flag = False
                ans += cnt
            if flag == False:
                break
            
print(ans+1)

Fixed submission:
n = int(input())
ai = [int(i) for i in input().split()]

ans = 0
s = 0
x = 0

r = 0
            
for l in range(n):
    while r <= n-1 and s+ai[r] == x^ai[r]:
        s += ai[r]
        x ^= ai[r]
        r += 1
    ans += (r-l)
    
    if l == r:
        r += 1
    else:
        s -= ai[l]
        x ^= ai[l]
        
print(ans)