Problem:
Score : 600 points

Problem Statement

Given are two sequences a=\{a_0,\ldots,a_{N-1}\} and b=\{b_0,\ldots,b_{N-1}\} of N non-negative integers each.

Snuke will choose an integer k such that 0 \leq k < N and an integer x not less than 0, to make a new sequence of length N, a'=\{a_0',\ldots,a_{N-1}'\}, as follows:

a_i'= a_{i+k \mod N}\ XOR \ x

Find all pairs (k,x) such that a' will be equal to b.

What is \mbox{ XOR }?

The XOR of integers A and B, A \mbox{ XOR } B, is defined as follows:

When A \mbox{ XOR } B is written in base two, the digit in the 2^k's place (k \geq 0) is 1 if either A or B, but not both, has 1 in the 2^k's place, and 0 otherwise.

For example, 3 \mbox{ XOR } 5 = 6. (In base two: 011 \mbox{ XOR } 101 = 110.)

Constraints

1 \leq N \leq 2 \times 10^5

0 \leq a_i,b_i < 2^{30}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
a_0 a_1 ... a_{N-1}
b_0 b_1 ... b_{N-1}

Output

Print all pairs (k, x) such that a' and b will be equal, using one line for each pair, in ascending order of k (ascending order of x for pairs with the same k).

If there are no such pairs, the output should be empty.

Sample Input 1

3
0 2 1
1 2 3

Sample Output 1

1 3

If (k,x)=(1,3),

a_0'=(a_1\ XOR \ 3)=1

a_1'=(a_2\ XOR \ 3)=2

a_2'=(a_0\ XOR \ 3)=3

and we have a' = b.

Sample Input 2

5
0 0 0 0 0
2 2 2 2 2

Sample Output 2

0 2
1 2
2 2
3 2
4 2

Sample Input 3

6
0 1 3 7 6 4
1 5 4 6 2 3

Sample Output 3

2 2
5 5

Sample Input 4

2
1 2
0 0

Sample Output 4

No pairs may satisfy the condition.

Solution in Python (3.4.3) (judge verdict: Accepted)

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

C = [a1^a2 for a1, a2 in zip(A, A[1:])] + [A[0]^A[-1]]
C = C + C
D = [b1^b2 for b1, b2 in zip(B, B[1:])] + [B[0]^B[-1]]

K = []
k = 0
while k < N:
  next_k = k
  is_first = True
  for i in range(N):
    if is_first and i>0 and C[k+i]==D[0]:
      next_k = k + i
      is_first = False
    if C[k+i] != D[i]:
      if next_k == k:
        k = k + i + 1
      else:
        if D[k+i-next_k] == C[k+i]:
          k = next_k
        else:
          k = k + i + 1
      break
  
  if i == N-1:
    K.append(k)
    if next_k == k:
      break
    else:
      k = next_k
      if len(K) == 2:
        diff = K[1] - K[0]
        while K[-1] < N:
          K.append(K[-1]+diff)
      
        _ = K.pop()
        break

for k in K:
  print(k, A[k]^B[0])