Reverse a doubly linked list

Hacker
Rank
Score
01
flag of Germany
100.00
01
flag of South Korea
100.00
01
flag of Australia
100.00
01
flag of United States
100.00
01
flag of United States
100.00
01
flag of United States
100.00
01
flag of United States
100.00
01
flag of United States
100.00

[deleted]

01
flag of null
100.00
01
flag of United States
100.00
01
flag of Hong Kong
100.00
01
flag of Singapore
100.00
01
flag of Morocco
100.00
01
flag of The Netherlands
100.00
01
flag of Costa Rica
100.00
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