Getting error while sorting a map by value

Asked Feb 07 '20 at 17:33

Active Feb 07 '20 at 19:22

Viewed 48 times

Here is my code:

bool cmp(const pair< pair<char,int>,int> &a,const pair< pair<char,int>,int> &b){
        return a.second>b.second;
    }

I'm trying to sort the map by value. I cant figure out how do i tackle this error.

Error: no match for 'operator-'(...)

edited Feb 07 '20 at 19:22

Yunus Temurlenk

asked Feb 07 '20 at 17:33

Abhishekk

1

You **cannot** sort a map by value. That is not the function signature required by a map either. – ChrisMM Feb 07 '20 at 17:35
Can you please post a [mcve] please. Thanks. – Werner Henze Feb 07 '20 at 17:35
Does this answer your question? [How to make a map sort by value C++](https://stackoverflow.com/questions/60098150/how-to-make-a-map-sort-by-value-c) – ChrisMM Feb 07 '20 at 17:36
Sounds like you might want to look into Boost.Bimap (sort one way, fast access the other way) – Asteroids With Wings Feb 07 '20 at 17:46

0 Answers0