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

Hacker
Rank
Score
161482
flag of India
00.00
161482
flag of Poland
00.00
161482
flag of India
00.00
161482
flag of India
00.00
161482
flag of United States
00.00
161482
flag of United States
00.00
161482
flag of Pakistan
00.00
161482
flag of Hungary
00.00
161482
flag of India
00.00
161482
flag of India
00.00
161482
flag of India
00.00
161482
flag of Sri Lanka
00.00
161482
flag of India
00.00
161482
flag of United States
00.00
161482
flag of India
00.00
161482
flag of India
00.00
161482
flag of India
00.00
161482
flag of India
00.00
161482
flag of India
00.00
161482
flag of India
00.00
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