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 = input()
seen = set()
reversed_unique = ""
# Iterate over the string in reverse order and build a new string with unique characters
for char in reversed(num):
if char not in seen:
seen.add(char)
reversed_unique += char
print(reversed_unique)