举例:
输入cool 则输出2
输入nan 则输出3
输入google 则输出4
直接上代码:
def count_sym(s):
length = len(s)
list_s = []
for i in range(length-1):
if s[i] == s[i+1]:
count = 2
key = 2*i +1
while i-1 >=0 and key -i+1 <=length-1:
i = i -1
if s[i] != s[key-i]:
break
count += 2
list_s.append(count)
try:
if s[i] == s[i+2]:
count = 3
key = 2*i + 2
while i -1 >= 0 and key-i+1 <=length-1:
i = i-1
if s[i] != s[key-i]:
break
count += 2
list_s.append(count)
except IndexError:
continue
return max(list_s)
print(count_sym('0o1o0'))