@[epiphany_nnnn](/user/1271841)
求关注qwp
```python
a = input()
f = 1
cnt = 0
for i in a:
if i == "(":
cnt = cnt + 1
elif i == ")":
if cnt != 0:
cnt = cnt - 1
else:
f = 0
if f == 1 and cnt == 0:
print("YES")
else:
print("NO")
``````
by huta0 @ 2024-02-03 11:27:18
明白了，谢谢佬
by epiphany_nnnn @ 2024-02-03 12:00:06