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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void printMap(map<int,string> fm){
  5. 	cout << "size = " << fm.size() << endl;
  6. 	/*map<int,string>::iterator it;
  7. 	for(it = fm.begin();it != fm.end();it++){
  8. 		cout << it->first << " " << it->second << endl;
  9. 	}*/
  10. 	for(auto pr:fm){
  11. 		cout << pr.first << " " << pr.second << endl;
  12. 	}
  13. 	cout << endl;
  14. }
  15. int main() {
  16. 	map<int,string> m1;
  17. 	m1[0] = "abc";
  18. 	m1[2] = "def";
  19. 	m1[6] = "gggk";//O(n)
  20. 	m1[5] = "lkj";
  21. 	printMap(m1);
  22.  
  23. 	m1[2];
  24. 	printMap(m1);
  25.  
  26. 	m1[2] = "arif";
  27. 	printMap(m1);
  28.  
  29. 	m1[3];
  30. 	printMap(m1);
  31.  
  32. 	m1.erase(0);
  33. 	printMap(m1);
  34.  
  35. 	m1.insert(make_pair(0,"md"));
  36. 	printMap(m1);
  37.  
  38. 	if(m1.empty()){
  39. 		cout << "map is empty\n";
  40. 	}
  41.  
  42. 	m1.clear();
  43. 	printMap(m1);
  44. 	if(m1.empty()){
  45. 		cout << "map is empty\n";
  46. 	}
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 5280KB
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stdin
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Standard input is empty
stdout
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size = 4
0 abc
2 def
5 lkj
6 gggk

size = 4
0 abc
2 def
5 lkj
6 gggk

size = 4
0 abc
2 arif
5 lkj
6 gggk

size = 5
0 abc
2 arif
3 
5 lkj
6 gggk

size = 4
2 arif
3 
5 lkj
6 gggk

size = 5
0 md
2 arif
3 
5 lkj
6 gggk

size = 0

map is empty
https://ideone.com/bLlBlC
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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