${\large\color{#92a1e8}【栈】表达式括号匹配(stack)}$

一个基础的栈

$\texttt{\color{#e51211}难度：入门}$ $\textit{\small\color{#e51211}easy}$

last update:2023/11/7

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${\large\color{#52a1e8}Python：}$

st=[""]*100
top=0
s=input()
flag=True
for i in range(len(s)):
    if s[i]=='(':
        top+=1
    if s[i]==')':
        top-=1
    if(top<0):
        flag=False
        break
if(flag==True and top==0):
    print("YES")
else:
    print("NO")