올바른 괄호

 

.

def solution(s):
    stack = []
    for i in range(len(s)):
        item = s[i]
        
        if item == '(':
            stack.append(item)
        else:
            if len(stack)>=1:
                stack.pop()
            else:
                return False
    
    if len(stack)==0:
        return True
    else:
        return False
        
        #print(s)