题解 | #提取不重复的整数#
提取不重复的整数
https://www.nowcoder.com/practice/253986e66d114d378ae8de2e6c4577c1
num = int(input())
ans = 0
s = set()
while num != 0:
if (num % 10) not in s:
ans = ans * 10 + num % 10
s.add(num % 10)
num //= 10
print(ans)
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