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  1. #include <iostream>
  2. #include <map>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	map<int, int> foo = {{1, 100}, {2, 200}, {4, 400}};
  7. 	map<char, int> bar = {{'1', 200}, {'3', 300}, {'5', 500}};
  8.  
  9. 	for(auto i = foo.begin(); i != foo.end(); ++i) {
  10. 		if(bar.end() == bar.find(static_cast<decltype(bar)::key_type>(i->first) + '0')){
  11. 			foo.erase(i);
  12. 		}
  13. 	}
  14.  
  15. 	for(auto i = bar.begin(); i != bar.end(); ++i) {
  16. 		const decltype(foo)::key_type key = i->first - '0';
  17.  
  18. 		if(foo.end() == foo.find(key) || foo[key] != i->second) {
  19. 			foo[key] = i->second;
  20. 		}
  21. 	}
  22.  
  23. 	for(const auto i : foo){
  24. 		cout << i.first + 10 << ": " << i.second << endl;
  25. 	}
  26.  
  27. 	return 0;
  28. }
Success #stdin #stdout 0s 3464KB
comments ()
stdin 
Standard input is empty
stdout 
11: 200
13: 300
15: 500
https://ideone.com/1GJhHV
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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