// perform one step of span measurement: // determine and return the span of the given day and price using recordStack // additional updates to perform: // add the measured span to the back of spanList // add the pair of  to the top of recordStack // update priceSpanMap as needed to ensure it always records the max span // of each price we have processed // Assume day and price are always non-negative // With your implementation of this method, the updating loop in runPrograms() // should be O(n) in non-debug mode (i.e. excluding printing overhead) // where n is the number of prices processed // assume hashMap updating and searching is O(1) method should be O(n) //default return, remove or updated as needed public int stepProcess(int day, int price) {