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MinStack.java

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class MinStack {

public Stack<Integer> s = new Stack<Integer>();

public Stack<Integer> helper = new Stack<Integer>();

public void push(int x) {

if (helper.isEmpty() == true || x <= helper.peek()) {

helper.push(x);

}

s.push(x);

}

public void pop() {

int top = s.pop();

if (helper.isEmpty() == false && top == helper.peek()) {

helper.pop();

}

}

public int top() {

return s.peek();

}

public int getMin() {

return helper.peek();

}

}