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Copy path155. Min Stack.py
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47 lines (35 loc) · 930 Bytes
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155. Min Stack.py
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47 lines (35 loc) · 930 Bytes
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class MinStack(object):
def __init__(self):
self.stack = []
def push(self, val):
"""
:type val: int
:rtype: None
"""
if not self.stack:
self.stack.append((val,val)) #同时记录当前值 和 最小值
else:
self.stack.append((val,min(val,self.stack[-1][-1])))
#also works
# self.stack.append((val,min(val,self.getMin())))
def pop(self):
"""
:rtype: None
"""
return self.stack.pop()
def top(self):
"""
:rtype: int
"""
return self.stack[-1][0]
def getMin(self):
"""
:rtype: int
"""
return self.stack[-1][-1]
# Your MinStack object will be instantiated and called as such:
# obj = MinStack()
# obj.push(val)
# obj.pop()
# param_3 = obj.top()
# param_4 = obj.getMin()