visit的现在分词,一代屠神林世荣,李璐珂
Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) -- Push element x onto stack. pop() -- Removes the element on top of the stack. top() -- Get the top element. getMin() -- Retrieve the minimum element in the stack.
class MinStack { Stack stack = new Stack(); Stack min = new Stack(); public void push(int x) { if(min.isEmpty() || x
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