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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int t;
  6. 	cin >> t;
  7. 	while(t--)
  8. 	{
  9. 		int n,r;
  10. 		cin >> n;
  11. 		string s;
  12. 		cin >> s;
  13. 		map<char, int> m;
  14. 		for(int i=0;i<n;i++)
  15. 		{
  16. 			m[s[i]]++;
  17. 		}
  18. 		int low=0;
  19. 		for(auto x: m)
  20. 		{
  21. 			if(low>x.second)
  22. 			{
  23. 				low = x.second;
  24. 			}
  25. 		}
  26. 		if(low >= 2 && (s[0]!=s[n-1]))
  27. 		{
  28. 			cout << s[n-1];
  29. 			for(int i=1;i<n;i++)
  30. 			{
  31. 				cout << s[i] ;
  32. 			}
  33. 			cout << endl;
  34. 		}
  35. 		else if(low >= 2 && (s[0]==s[n-1]) && (s[0]!=s[1]))
  36. 		{
  37. 			cout << s[0] << s[0] ;
  38. 			for(int i=2;i<n;i++)
  39. 			{
  40. 				cout << s[i] ;
  41. 			}
  42. 			cout << endl;
  43. 		}
  44. 		else if(low < 2)
  45. 		{
  46. 			int l;
  47. 			for(auto x : m)
  48. 			{
  49. 				if(low == x.second)
  50. 				{
  51. 					r = l;
  52. 					break;
  53. 				}
  54. 				l++;
  55. 			}
  56. 			if(l!=0 && l!=(n-1))
  57. 			{
  58. 				for(int i=0;i<n;i++)
  59. 				{
  60.  
  61. 					if(l==i)
  62. 					{
  63. 						s[i-1];
  64. 					}
  65. 					cout << s[i] ;
  66. 				}
  67. 				cout << endl;
  68. 			}
  69. 			if(l==0)
  70. 			{
  71. 				cout << s[1] ;
  72. 				for(int i=1;i<n;i++)
  73. 				{
  74. 					cout << s[i] ;
  75. 				}
  76. 				cout << endl;
  77. 			}
  78. 			else if(l==(n-1))
  79. 			{
  80. 				for(int i=0;i<n-1;i++)
  81. 				{
  82. 					cout << s[i] ;
  83. 				}
  84. 				cout << s[n-2] << endl;
  85. 			}
  86. 		}
  87. 	}
  88. 	return 0;
  89. }
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin
copy 
6
3
abc
4
xyyx
8
alphabet
1
k
10
aabbccddee
6
ttbddq
stdout
copy 
abc
xyyx
alphabet
k
aabbccddee
ttbddq
https://ideone.com/7WvCzG
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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