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minStack.py
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minStack.py
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class MinStack:
def __init__(self):
"""
initialize your data structure here.
"""
self.stack= []
def push(self, x):
"""
:type x: int
:rtype: nothing
"""
if not self.stack:self.stack.append((x,x))
else:
self.stack.append((x,min(x,self.stack[-1][1])))
def pop(self):
"""
:rtype: nothing
"""
if self.stack: self.stack.pop()
def top(self):
"""
:rtype: int
"""
if self.stack: return self.stack[-1][0]
else: return None
def getMin(self):
"""
:rtype: int
"""
if self.stack: return self.stack[-1][1]
else: return None
# 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()