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minstack.py
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47 lines (37 loc) · 1007 Bytes
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class MinStack(object):
def __init__(self):
"""
initialize your data structure here.
"""
self.stack = []
self.minstack = []
def push(self, x):
"""
:type x: int
:rtype: nothing
"""
self.stack.append(x)
if self.minstack == [] or self.minstack[-1][0] > x:
self.minstack.append((x,1))
elif x == self.minstack[-1][0]:
self.minstack[-1] = (x,self.minstack[-1][1]+1)
def pop(self):
"""
:rtype: nothing
"""
p = self.stack.pop()
if p == self.minstack[-1][0]:
if self.minstack[-1][1] > 1:
self.minstack[-1] = (self.minstack[-1][0], self.minstack[-1][1] - 1)
else:
self.minstack.pop()
def top(self):
"""
:rtype: int
"""
return self.stack[-1]
def getMin(self):
"""
:rtype: int
"""
return self.minstack[-1][0]