题解 | #找出字符串中第一个只出现一次的字符#
找出字符串中第一个只出现一次的字符
https://www.nowcoder.com/practice/e896d0f82f1246a3aa7b232ce38029d4
while True:
try:
s = input().strip()
dic = {}
for x in set(s):
dic[x] = s.count(x)
# print(dic)
lst = []
for i in s:
if dic[i] == 1:
lst.append(i)
if lst:
print(lst[0])
else:
print("-1")
except:
break
查看13道真题和解析