๋ฌธ์
https://www.acmicpc.net/problem/10799
ํ์ด
# ๋ฐฑ์ค 10799๋ฒ ๋ฌธ์ - ์ ๋ง๋๊ธฐ
a = list(input())
s = []
b = 0
for i in range(len(a)):
if a[i] == '(':
s.append('(')
else:
if a[i-1] == '(':
s.pop()
b = b+len(s)
else:
s.pop()
b = b+1
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