You are given N elements and your task is to Implement a Stack in which you can get a minimum element in O(1) time. Example 1: Input: push(2) push(3) pop() getMin() push(1) getMin() Output: 2 1 Explanation: In the first test case for query  push(2)  Insert 2 into the stack.   The stack will be {2} push(3)  Insert 3 into the stack.   The stack will be {2 3} pop() Remove top element from stack   Poped element will be 3 the   stack will be {2} getMin() Return the minimum element   min element will be 2  push(1) Insert 1 into the stack. The stack will be {2 1} getMin() Return the minimum element   min element will be 1.

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