import java.util.Stack;
public class MinStack {
private Stack nums;
private Stack mins;
/** initialize your data structure here. */
public MinStack() {
nums = new Stack<>();
mins = new Stack<>();
}
public void push(int x) {
nums.push(x);
if (mins.isEmpty() || x <= mins.peek()) {
mins.push(x);
}
}
public void pop() {
int top = nums.pop();
if (mins.peek() == top) {
mins.pop();
}
}
public int top() {
return nums.peek();
}
public int getMin() {
return mins.peek();
}
}