Set .difference() Operation

Hacker
Rank
Score
01
flag of Bulgaria
10.00
01
flag of United States
10.00
01
flag of India
10.00

[deleted]

01
flag of null
10.00
01
flag of Brazil
10.00
01
flag of India
10.00
01
flag of Canada
10.00
01
flag of France
10.00
01
flag of United States
10.00
01
flag of India
10.00
01
flag of Jordan
10.00
01
flag of Poland
10.00
01
flag of United States
10.00
01
flag of United States
10.00
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