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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void pMap(map<string,int> m){
  5. 	cout << "size = " << m.size() << endl;
  6. 	for(auto it = m.begin();it != m.end();++it){
  7. 		cout << it->first << " " << it->second << endl;
  8. 		//cout << (*it).first << " " << (*it).second << endl;
  9. 		// string s = it->first;
  10. 		// cout << s << " " << m[s] << endl;
  11. 	}
  12. 	for(const auto &pair : m){
  13. 		cout << pair.first << " " << pair.second << endl;
  14. 	}
  15. 	cout << endl;
  16. }
  17.  
  18. int main(){
  19. 	map<string,int> m;
  20.  
  21. 	//basic initialization
  22. 	// m["date"] = 22;
  23. 	// m["month"];	//declared and initialized to zero.
  24. 	// m["month"] = 05, m["year"] = 2004;
  25. 	// pMap(m);
  26.  
  27. 	//initializing using pair.
  28. 	// m.insert({"Date",22});
  29. 	// m.insert(make_pair("month",05));
  30. 	// m["year"];
  31. 	// m.insert({"year",2004});
  32. 	// pMap(m);
  33. 	// //insert() doesnt update pre-existent keys!!!
  34. 	// m["year"] = 2004;
  35. 	// pMap(m);
  36.  
  37. 	//using find(key):return an it for the key.
  38. 	// map<int,int> m2 = {{1,6},{2,8},{4,9}};
  39. 	// int n;	cin >> n;
  40. 	// auto it = m2.find(n); // return an it for the key 1;
  41. 	// it == m2.end() ? cout << "not found\n" : cout << "found\n";
  42.  
  43. 	//using erase(key/it) to erase a particular element from the map.
  44. 	// map<int,int> m2 = {{1,6},{2,8},{4,9}};
  45. 	// int n;	cin >> n;
  46. 	// auto it = m2.find(n); // return an it for the key 1;
  47. 	// if(it != m2.end())	m2.erase(it);
  48. 	// else cout << "not found\n";
  49. 	//pMap(m2);
  50.  
  51.  
  52.  
  53. 	return 0;
  54. }
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/g5cJNJ
language:
C++14 (clang 8.0)
created:
2 days ago
visibility:
public

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