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385. Mini Parser
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385. Mini Parser
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# """
# This is the interface that allows for creating nested lists.
# You should not implement it, or speculate about its implementation
# """
#class NestedInteger(object):
# def __init__(self, value=None):
# """
# If value is not specified, initializes an empty list.
# Otherwise initializes a single integer equal to value.
# """
#
# def isInteger(self):
# """
# @return True if this NestedInteger holds a single integer, rather than a nested list.
# :rtype bool
# """
#
# def add(self, elem):
# """
# Set this NestedInteger to hold a nested list and adds a nested integer elem to it.
# :rtype void
# """
#
# def setInteger(self, value):
# """
# Set this NestedInteger to hold a single integer equal to value.
# :rtype void
# """
#
# def getInteger(self):
# """
# @return the single integer that this NestedInteger holds, if it holds a single integer
# Return None if this NestedInteger holds a nested list
# :rtype int
# """
#
# def getList(self):
# """
# @return the nested list that this NestedInteger holds, if it holds a nested list
# Return None if this NestedInteger holds a single integer
# :rtype List[NestedInteger]
# """
class Solution(object):
def deserialize(self, s):
"""
:type s: str
:rtype: NestedInteger
"""
stack = []
curlist = []
num = None
negtive = 1
for c in s:
if c.isdigit():
if num is None:
num = 0
num = num * 10 + int(c)
elif c == '-':
negtive = -1
elif c == ',':
if num is not None:
curlist.append(num*negtive)
num = None
negtive = 1
elif c == '[':
stack.append(curlist)
curlist = []
num = None
elif c == ']':
prevlist = stack.pop()
if num is not None:
curlist.append(num*negtive)
prevlist.append(curlist)
curlist = prevlist
num = None
negtive = 1
if not '[' in s:
return num * negtive
else:
return prevlist[0]