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use two extra stacks to store min and max at every level
- Anonymous September 13, 2010public class MinMaxStack extends Stack{
Stack min = new Stack();
Stack max = new Stack();
public object pop(){
return super.pop();
min.pop();max.pop();
}
public void push(object){
super.push(object);
if(min.peek()>=object) min.push(object);
else min.push(min.peek());
if(max.peek()<=object) max.push(object);
else max.push(max.peek());
}
public object min(){
return min.pop();
}
public object max(){
return max.pop();
}
}