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155.py
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155.py
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class MinStack(object):
def __init__(self):
"""
initialize your data structure here.
"""
self.st = []
self.mins = []
def push(self, x):
"""
:type x: int
:rtype: None
"""
self.st.append(x)
if not self.mins:
self.mins.append(x)
else:
self.mins.append(min(x, self.mins[-1]))
def pop(self):
"""
:rtype: None
"""
if not self.st:
return
x = self.st.pop()
self.mins.pop()
return x
def top(self):
"""
:rtype: int
"""
if not self.st:
return
return self.st[-1]
def getMin(self):
"""
:rtype: int
"""
if not self.st:
return
return self.mins[-1]
# Your MinStack object will be instantiated and called as such:
# obj = MinStack()
# obj.push(x)
# obj.pop()
# param_3 = obj.top()
# param_4 = obj.getMin()