public class MinStack {
Stack normalStack;
Stack minValueStack;
/** initialize your data structure here. */
public MinStack() {
normalStack = new Stack();
minValueStack = new Stack();
}
public void push(int x) {
normalStack.push(x);
if (minValueStack.empty() || x < minValueStack.peek()) {
minValueStack.push(x);
} else {
minValueStack.push(minValueStack.peek());
}
}
public void pop() {
normalStack.pop();
minValueStack.pop();
}
public int top() {
return normalStack.peek();
}
public int getMin() {
return minValueStack.peek();
}
}
/**
* 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();
*/