题解 | #四则运算#
四则运算
http://www.nowcoder.com/practice/9999764a61484d819056f807d2a91f1e
a = input().strip()
b = {'[':'(',']':')','{':'(','}':')'}
# 创建栈
stack = []
for i in a :
if i not in b.keys():
stack.append(i)
else :
stack.append(b[i])
print(int(eval(''.join( j for j in stack))))
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