eg. 5
1 -> ? -> 5
2 -> ? -> 4
3 -> ? -> 3
4 -> ? -> 2
5 -> ? -> 1
Case1:
1 -> ? -> 5 -> ? -> 1 2 -> ? -> 4 -> ? -> 2
merge above
1 -> 2 -> 5 -> 4 -> 1
Case2:
3 -> 3 -> 3
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