public class MinStack {

int min = Integer.MAX_VALUE;

Stack<Integer> stack = new Stack<Integer>();

/** initialize your data structure here. */

public MinStack() {

}

public void push(int x) {

if(x <= min){

stack.push(min);

min=x;

}

stack.push(x);

}

public void pop() {

if(stack.pop() == min) min=stack.pop();

}

public int top() {

return stack.peek();

}

public int getMin() {

return min;

}

}

/**

* Your MinStack object will be instantiated and called as such:

* MinStack obj = new MinStack();

* obj.push(x);

* obj.pop();

* int param_3 = obj.top();

* int param_4 = obj.getMin();

*/