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How to find all the repetitive values ​​in the MAP container? C++

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How to find all the repetitive values ​​in the MAP container? C++.
Display only repetitive values, their keys and the number of repetitions


Answer 1, Authority 100%

Get one more mapp

std :: map & lt; int, std :: vector & lt; int & gt; & gt;

just put the value, and in the vector keys where they appear

Here is an example code:

# include & lt; Cstdlib & gt;
#Include & lt; iostream & gt;
#Include & lt; Map & GT;
#Include & lt; vector & gt;
INT MAIN () {
 STD :: MAP & LT; INT, INT & GT; m {{1, 1}, {2, 9}, {3, 1},
            {4, 2}, {5, 2}, {6, 3}
            };
 STD :: MAP & LT; INT, STD :: Vector & LT; int & gt; & gt; RET {};
 For (Const Auto & Amp; V: M) {
   RET [v.second] .push_back (v.first);
 }
 For (Const Auto & Amp; V: RET) {
   if (v.second.size () & gt; 1) {
     STD :: COUT & LT; & LT; V.First & LT; & LT; ":";
     For (Const Auto & Amp; VV: v.second) {
       STD :: COUT & LT; & LT; VV & LT; & LT; "";
     }
     STD :: COUT & LT; & LT; STD :: ENDL;
   }
 }
 Return EXIT_SUCCESS;
}

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