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  1. #include<iostream>
  2. #include<string>
  3. #include<vector>
  4. #include<map>
  5. #include<algorithm>
  6. #include<queue>
  7. #include<fstream>
  8. #include<bitset>
  9. using namespace std;
  10.  
  11. bool test(string s)
  12. {
  13. 	if (s.size() == 0)
  14. 		return false;
  15. 	for (int i = 0; i < s.size(); i++)
  16. 	{
  17. 		if (s[i] >= '0' && s[i] <= '9' || s[i] >= 'a' && s[i] <= 'z')
  18. 			;
  19. 		else
  20. 			return false;
  21. 	}
  22. 	return true;
  23. }
  24.  
  25. int main()
  26. {
  27. 	string s;
  28. 	cin >> s;
  29.  
  30. 	string str = "";
  31. 	int i;
  32. 	for (i = 0; i < s.size(); i++)
  33. 	{
  34. 		if (s[i] != '@')
  35. 			str += s[i];
  36. 		else
  37. 			break;
  38. 	}
  39.  
  40. 	bool isok = test(str);
  41. 	str = "";
  42. 	i++;
  43. 	for (i; i < s.size(); i++)
  44. 	{
  45. 		if (s[i] != '.')
  46. 			str += s[i];
  47. 		else
  48. 			break;
  49. 	}
  50.  
  51. 	isok = isok && test(str);
  52. 	str = "";
  53. 	i++;
  54. 	for (i; i < s.size(); i++)
  55. 		str += s[i];
  56.  
  57. 	isok = isok && test(str);
  58.  
  59. 	cout << (isok ? "YES" : "NO") << endl;
  60.  
  61.  
  62. 	return 0;
  63. }
Success #stdin #stdout 0s 4432KB
comments (?)
stdin
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Standard input is empty
stdout
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NO
https://ideone.com/IA4Cts
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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