C++ Playground - Multimap all Combinations Pass by Reference: Online Interpreter, Compiler & Editor

CPP

cpp

//Uses combination function from this link:
//https://www.tutorialspoint.com/cplusplus-program-to-generate-all-possible-combinations-out-of-a-b-c-d-e 
#include<iostream>
#include <map>
using namespace std;
void Combi(multimap<int,int> &Map, int reqLen, int s, int currLen, bool check[], int l)
{
   if(currLen > reqLen)
   return;
   else if (currLen == reqLen) {
      int i=0;
      for (multimap<int,int>::iterator p = Map.begin(); p!=Map.end(); ++p)
      {
          if (check[i] == true)
          {
              cout << "(" << p->first << "," << p->second << ") ";
          }
          i++;
      }
      cout<<"\n";
      return;
   }
   if (s == l) {
      return;
   }
   check[s] = true;
   Combi(Map, reqLen, s + 1, currLen + 1, check, l);
   check[s] = false;

OUTPUT