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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. 		int n;
  9. 		cin >> n;
  10. 		string s[n];
  11. 		int flag(0);
  12. 		for(int i=0;i<n;i++){
  13. 			cin >> s[i];
  14. 		}
  15. 		for(int i=0;i<n;i++){
  16. 			if(s[i].length() == 3 && s[i][0] == s[i][2]){
  17. 				flag = 1;
  18. 				break;
  19. 			}
  20. 		}
  21. 		for(int i=0;i<n;i++){
  22. 			if(s[i].length() == 1){
  23. 				flag =1;
  24. 				break;
  25. 			}
  26. 			int flag1(0);
  27. 			for(int j=0;j<s[i].length();j++){
  28. 				if(s[i][j] != s[i][0]){
  29. 					flag1 = 1;
  30. 					break;
  31. 				}
  32. 			}
  33. 			if(flag1 == 0){
  34. 				flag = 1;
  35. 			}
  36. 		}
  37. 		if(flag == 1){
  38. 			cout << "YES" << endl;
  39. 		}
  40. 		else{
  41. 			set<string> s2;
  42. 			set<string> s3;
  43. 			for(int i=0;i<n;i++){
  44. 				if(s[i].length() == 2){
  45. 					string x = s[i];
  46. 					reverse(x.begin(),x.end());
  47. 					if(s2.find(x) != s2.end()){
  48. 						flag = 1;
  49. 						break;
  50. 					}
  51. 					s2.insert(s[i]);
  52. 				}
  53. 				if(s[i].length() == 3){
  54. 					string x = s[i];
  55. 					reverse(x.begin(),x.end());
  56. 					if(s3.find(x) != s3.end()){
  57. 						flag = 1;
  58. 						break;
  59. 					}
  60. 					s3.insert(s[i]);
  61. 					string y;
  62. 					y += s[i][2];
  63. 					y += s[i][1];
  64. 					// cout << y << endl;
  65. 					if(s2.find(y) != s2.end()){
  66. 						flag = 1;
  67. 						break;
  68. 					}
  69. 				}
  70. 			}
  71. 			if(flag == 1){
  72. 				cout << "YES" << endl;
  73. 			}
  74. 			else{
  75. 				set<string> fin;
  76. 				for(int i=n-1;i>-1;i--){
  77. 					if(s[i].length() == 2){
  78. 						fin.insert(s[i]);
  79. 					}
  80. 					if(s[i].length() == 3){
  81. 						string zz;
  82. 						zz += s[i][1];
  83. 						zz += s[i][0];
  84. 						if(fin.find(zz) != fin.end()){
  85. 							flag = 1;
  86. 							break;
  87. 						}
  88. 					}
  89. 				}
  90. 				if(flag == 1){
  91. 					cout << "YES" << endl;
  92. 				}
  93. 				else{
  94. 					cout << "NO" << endl;
  95. 				}
  96.  
  97. 			}
  98. 		}
  99. 	}
  100. 	return 0;
  101. }
Success #stdin #stdout 0.01s 5516KB
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YES
https://ideone.com/L0u5iG
language:
C++14 (gcc 8.3)
created:
326 days ago
visibility:
public

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