solve in c$++$

REQUIREMENTS:

A certain charity recruits twelve volunteers each year to spearhead its fundraising efforts.

Each volunteer is assigned one month to take the lead organizing events. As these are

volunteers, the charity does it best to accommodate everyone$$s schedule as much as

possible. Before the year begins, each volunteer is asked to give his or her top three

choices for a month to serve. These preferences are likely to overlap. For example:

Susan John Mary

first choice December December March

second choice February March May

third choice April February April

Obviously both Susan and John cannot be assigned December; one of them will need to

be assigned a different month. The best possible assignment for the three volunteers

$($ignoring the other nine for the moment$)$ would be

Susan $=$ February John $=$ December Mary $=$ March

as John and Mary get their first choice and Susan receives her second. For twelve

volunteers, the task above is humanly unmanageable, and so the charity has contacted

you to automate this process for them.

The charity proposes that the following point system be used when determining the

desirability of a particular month assignment to its volunteers:

$3$ points for each volunteer assigned his or her first choice

$2$ points for each volunteer assigned his or her second choice

$1$ point for each volunteer assigned his or her third choice

$0$ points for each volunteer not assigned any of his or her choices

Thus, each of the $12!$ possible assignments of months to volunteers will have a

desirability between $0$ and $36.$ Your task is to find the best calendar assignment.

SPECIFICATIONS:

Design and implement a program to find the best possible calendar assignment for the

charity$$s volunteers. Your authored code MUST be a client of the UnsortedType class

presented in the textbook.

INPUT:

$$ The names of the twelve volunteers followed by their month preferences. The

information for each volunteer will be listed on a single line in the file

"volunteers.dat" in the following format:

where is a string of up to $20$ characters, and $,,$ and are integers between $1$ and $12.$

OUTPUT:

$$ A listing of the best possible calendar assignments found so far as your

program progresses through the permutations.

EXAMPLE OUTPUT:

SCORE: $12$

January Yuen

February Bill

March Steve

April Alice

May Susan

June Julio

July Gary

August Mike

September Mary

October Rich

November Shilpa

December Ann

SCORE: $14$

January Steve

February Julio

March Shilpa