Set .discard(), .remove() & .pop()

Hacker
Rank
Score
01
flag of Brazil
10.00
01
flag of United States
10.00
01
flag of India
10.00
01
flag of Australia
10.00
01
flag of United States
10.00
01
flag of United States
10.00
01
flag of Canada
10.00

[deleted]

01
flag of null
10.00
01
flag of China
10.00
01
flag of India
10.00
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