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  1. #include <iostream>
  2. #include <map>
  3. #include <string>
  4.  
  5. template <typename K, typename V>
  6. void my_merge(std::map<K, V>& m1, const std::map<K, V> m2)
  7. {
  8.     auto it1 = m1.begin();
  9.     auto it2 = m2.begin();
  10.  
  11.     while (it1 != m1.end() && it2 != m2.end()) {
  12.         if (*it1 < *it2) {
  13.             it1 = m1.erase(it1);
  14.         } else if (*it2 < *it1) {
  15.             m1.insert(*it2);
  16.             ++it2;
  17.         } else {
  18.             ++it1;
  19.             ++it2;
  20.         }
  21.     }
  22.     m1.erase(it1, m1.end());
  23.     m1.insert(it2, m2.end());
  24. }
  25.  
  26. int main() {
  27.     std::map<int, std::string> m1 {{1, "One"}, {2, "Two"}, {3, "Three"}};
  28.     const std::map<int, std::string> m2 {{1, "OneB"}, {2, "TwoB"}, {4, "Four"}};
  29.  
  30.     my_merge(m1, m2);
  31.     for (const auto& p : m1) {
  32.         std::cout << p.first << ":" << p.second << std::endl;
  33.     }
  34. }
  35.  
Success #stdin #stdout 0s 3464KB
comments (?)
stdin
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Standard input is empty
stdout
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1:OneB
2:TwoB
4:Four
https://ideone.com/sKxoIQ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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