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

Hacker
Rank
Score
173325
flag of India
00.00
173325
flag of
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00

[deleted]

173325
flag of null
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of India
00.00
173325
flag of Sri Lanka
00.00
173325
flag of India
00.00
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