0 [1, 1, 1, 3, 1]
3 [1, 1, 2]
2 [1, 1]
4 [3, 1, 1, 2]
0 [1, 1, 2]
2 [1, 1]
3 [3, 1, 1]
0 [1, 1]
QAQ