1991B - AND Reconstruction - CodeForces Solution

for _ in range(int(input())):
    n = int(input())
    l = list(map(int,input().split()))
    answer = [l[0]]
    for i in range(1,len(l)):
        answer.append(l[i]|l[i-1])
    answer.append(l[-1])
    new = []
    for i in range(1,len(answer)):
        new.append(answer[i]&answer[i-1])
    if new == l:
        print(*answer)
    else:
        print(-1)