# Implement a C++ code for a Priority Queue

Analysis of Financial Time Series: USD/EGP Exchange Price

The daily USD/EGP exchange prices R are available over the period from December 1, 2016

to April 21, 2017 in the file : “[login to view URL]” . Assuming that the average exchange price over

the given period is M, a change Ci in a given day (i) is positive when the price rises over M,

and it is negative when it drops below that average.

From the given data set, we need to find the dates of each of the N most positive changes (e.g.

N = 10) as they represent the N highest exchange prices over the whole data set. Likewise, we

need to find the dates of each of the N most negative changes (e.g. N = 10) as they represent

the N lowest exchange prices over the whole data set.

This problem can be solved using Priority Queues where each item is composed of 2 elements:

the date and the exchange price change from the average. Priority here is for the price change.

We also need to find the start date and the end date of the contiguous period over which the

sum of price changes C is maximum.

This problem is called the Maximum Subsequence Problem. The problem statement is as

follows:

Given a sequence of n values (possibly negative), C0, C1, ..., Cn-1, find the values of the indices

(i,j) that maximize the value of the sum

(This is zero if all values are negative).

Example: Suppose the changes in price are: - 0.2, 1.1, - 0.4, 1.3, - 0.5, - 0.2

Smax = C1 + C2 + C3 = 2.0 (hence i = 1 and j = 3)

Required Implementations:

1. Implement the PQ class.

2. Find the N highest and N lowest exchange rate days over the whole data set (e.g. N =

10).

3. Implement the Maximum Subsequence Algorithm and find the start and end days of

the contiguous period over which the sum of price changes is maximum.

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