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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5. 	int n, m;
  6. 	cin >> n >> m;
  7. 	string s[105], ans = "", rev = "";
  8. 	for (int i = 0;i < n;i++)
  9. 		cin >> s[i];
  10. 	for (int i = 0; i < n;i++)
  11. 	{
  12. 		for (int j = i + 1;j < n;j++) {
  13. 			string x = s[i];
  14. 			reverse(x.begin(), x.end());
  15. 			if (s[j] == x)
  16. 			{
  17. 				ans += s[i];
  18. 				break;
  19. 			}
  20. 		}
  21. 	}
  22. 	for (int i = 0; i < n; i++)
  23. 	{
  24. 		bool fla = true;
  25. 		for (int l = 0, k = s[i].size() - 1;l < k;l++, k--)
  26. 		{
  27. 			if (s[i][l] != s[i][k])
  28. 			{
  29. 				fla = false;
  30. 				break;
  31. 			}
  32. 		}
  33. 		if (fla) {
  34. 			rev= s[i];
  35. 			break;
  36. 		}
  37. 	}
  38. 	cout << ans.size() * 2 + rev.size()<<"\n";
  39. 	cout << ans << rev;
  40. 	reverse(ans.begin(), ans.end());
  41. 	cout << ans;
  42. 	return 0;
  43. }
Success #stdin #stdout 0.01s 5504KB
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stdin
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4 2
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xo
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stdout
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6
oxooxo
https://ideone.com/DJhZlv
language:
C++14 (clang 8.0)
created:
2 years ago
visibility:
public

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