C++ programming Display unique data

[mathiasx]

Currently I read a text file line by line and find all matching data and display them.

So if my text file data is a below
Bag|30|23Mar2015
Bag|30|23Mar2015
Bag|30|24Mar2015
Bag|30|25Mar2015
Bag|30|23Mar2015

And I wish to display the output as
23Mar2015 90
24Mar2015 30
25Mar2015 30

But currently what I able to do is
23Mar2015 30
23Mar2015 30
24Mar2015 30
25Mar2015 30
23Mar2015 30

How do I add those that have unique date value together and display as one? Can anyone enlighten me?

[Peter87]

There are more than one way to do it but the easiest way is probably to use a map, if you know how it works.

http://www.cplusplus.com/reference/map/map/

[mathiasx]

Hi Peter87, i am quite new to C++, and not sure how does map works, is there any other ways to do the required stuff i need?