题解 | 字符个数统计
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
from collections import Counter
input_str = input()
d = Counter()
ans = 0
for s in input_str:
d[s] += 1
if d[s] == 1:
ans += 1
print(ans)
计数器计数，只出现1次总数+1
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