题解 | 找出字符串中第一个只出现一次的字符
import sys
from collections import Counter
raw_input = []
for i,line in enumerate(sys.stdin):
raw_input.append(line.strip())
if i == 1:
break
input_str = raw_input[0]
res = -1
counts = Counter([c for c in input_str])
for c in input_str:
if counts[c] == 1:
res = c
break
print(res)
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