0
0
3 deque([0, 1])
3 deque([7, 8, 9])
2
1
1 deque([0])
7 deque([8, 9])
3
2
0 deque([])
7 deque([8, 9])
10
3
999999999 deque([])
7 deque([8, 9])
11
4
999999999 deque([])
8 deque([9])
12 5