s = input()
level = {s} #set型 def isValid(string):
count = 0
for si in string:
for i in range(len(si)):
if si[i] == '(':
count += 1
elif si[i] == ')':
count -= 1
if count < 0:
return
return count def b(seting):
y = 0
for x in seting:
if isValid(x) == 0:
y = y + 1
return y a = isValid(level)
print(a) if a > 0:
next_level = set()
while a > 0:
for item in level:
for i in range(len(item) + 1):
next_level.add(item[:i] + ")" + item[i:])
level.symmetric_difference_update(next_level) # 用next_level更新level
a -= 1
print(b(next_level))
elif a < 0:
next_level = set()
while a < 0:
for item in level:
for i in range(len(item) + 1):
next_level.add(item[:i] + "(" + item[i:])
level.symmetric_difference_update(next_level) # 用next_level更新level
a = a + 1
print(b(next_level))
测试系统提交显示错误，希望有大佬帮忙看看哪里有问题。
