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  1. // set::key_comp
  2. #include <iostream>
  3. #include <set>
  4. #include <map>
  5. #include <algorithm>
  6.  
  7. using namespace std;
  8.  
  9. int main ()
  10. {
  11.   std::set<int> myset;
  12.   int highest1, highest2, highest3;
  13.   typedef map<int, int> MyMap;
  14.   MyMap mymap;
  15.  
  16.   std::set<int>::key_compare   myCompKeyForSet = myset.key_comp();
  17.   std::set<int>::value_compare myCompValForSet = myset.value_comp();
  18.  
  19.   MyMap::key_compare   myCompKeyForMap = mymap.key_comp();
  20.   MyMap::value_compare myCompValForMap = mymap.value_comp();
  21.  
  22.  
  23.   for (int i=0; i<=5; i++) {
  24.       myset.insert(i);
  25.       mymap.insert(make_pair(i, 2*i));
  26.   }
  27.  
  28.   //////SET///////
  29.  
  30.   highest1=*myset.rbegin();
  31.   std::set<int>::iterator it=myset.begin();
  32.   while ( myCompKeyForSet(*it, highest1) ) it++;
  33.   std::cout << "\nhighest1 is " << highest1;
  34.  
  35.  
  36.   highest2 = *myset.rbegin();
  37.   it=myset.begin();
  38.   while ( myCompValForSet(*it, highest2) ) it++;
  39.   std::cout << "\nhighest2 is " << highest2;
  40.  
  41.   //////MAP///////
  42.  
  43.   MyMap::iterator it2 = mymap.begin();
  44.   highest3 = mymap.rbegin()->first;
  45.   while ( myCompKeyForMap((it2->first), highest3) ) it2++;
  46.   std::cout << "\nhighest3 is " << highest3;
  47.  
  48.   std::pair<int,int> highest4 = *mymap.rbegin();
  49.   it2 = mymap.begin();
  50.   while ( myCompValForMap(*(it2), highest4) ) it2++;
  51.   std::cout << "\nhighest4 is " << highest4.second;
  52.  
  53.   return 0;
  54. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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highest1 is 5
highest2 is 5
highest3 is 5
highest4 is 10
https://ideone.com/n4QhI9
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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