STL question

[atomic kraken]

When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

[dusk quartz]

some documentation for multimap https://en.cppreference.com/w/cpp/container/multimap
Maybe you'll be able to find what you're looking for here. Try reading the descriptions of what all the available functions do

[tribal creek]

i have already read the whole documentation

can you give me any hint?

because i have spent a lot time and still havn't got the idea

the problem is how i supposed to search with struct field?

int count = cpis...........(checkCpi)

in this line

im searching whole struct in multimap

but key is of type double

[dusk quartz]

well I think youre likely looking for multiset instead then since youre searching for whole Students not just a specific part

although honestly this question isnt great

But yeah multiset and then count and find

[tribal creek]

true

[dusk quartz]

its unclear how a specific comparison works between Students though

Do students compare equal ignoring the name?

[tribal creek]

yesss

i suppose

that's why there is a empty struct with cpi only?

i guess

[dusk quartz]

If they do then multiset is probably the way. Although with those you can actually specify an equality operator for multiset as part of the template parameters

[tribal creek]

ohhhhhh lemme try that

i can pass lambda right?

[dusk quartz]

I doubt they want that though since it doesnt fit the answer structure

[tribal creek]

i can pass euality operator in multiset parameter tho

[tribal creek]

is this correct?

but how i suppose to use count with checkCpi

nvm this question is bad

thank you for your response!

[atomic kraken]

Thank you and let us know if you have any more questions!

This thread is now set to auto-hide after an hour of inactivity

[dusk quartz]

you want a set if youre doing set operations not a map

youre not mapping the cpi

well you are

but the way they are doing it is via a set

[tribal creek]

[dusk quartz]

its not that confusing. You just replace multimap<double Student, ...> with multiset<Student, ...>

and suddenly all the operations make sense