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Ihave a vector that contains monthyear

Jan2013

Jan2013

Jan2013

Jan2014

Jan2014

Jan2014

Jan2014

Feb2014

Feb2014

Basically what I want to do is to search through the vector, for every same record, group them

together like

e.g

```
total count for Jan2013 = 3;
total count for Jan2014 = 4;
total count for Feb2014 = 2;
```

Of course as we know, we can just simply write multiple if to solve it

```
if(monthyear = "Jan2013") {
//add count
}
if(monthyear = "Jan2014") {
//add count
}
if(monthyear = "Feb2014") {
//add count
}
```

but no way a programmer is going code it in this way.

what if there's additional monthyear march2014,april2014,may2014 all the way to dec2014

and jan2015-dec2015 and so on.

I don't think I should be adopting this kind of hard-coding method in the

long run and looking for a more dynamic approach.

I not asking for codes, but just some steps and perhaps give me some hints on what c++ methods should I be researching on.

Thanks in advance