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  1. #include <stdio.h>
  2. //#include <conio.h>
  3. #include <string>
  4. #include <vector>
  5. #include <math.h>
  6. #include <stack>
  7. #include <queue>
  8. #include <deque>
  9. #include <set>
  10. #include <map>
  11. #include <algorithm>
  12. #include <stdlib.h>
  13. #include <iostream>
  14. #include <sstream>
  15. using namespace std;
  16. typedef long long LL;
  17. int k;
  18. int main()
  19. {
  20. 	ios::sync_with_stdio(0);
  21. 	cin.tie(0); cout.tie(0);
  22. 	cin >> k;
  23. 	for (int i = 0; i < k; i++) {
  24. 		int n;
  25. 		string s, t;
  26. 		vector<pair<int, int>> res;
  27. 		cin >> n >> s >> t;
  28. 		for (int i = 0; i < n - 1; i++) 
  29. 			if (s[i] != t[i]) {
  30. 				int co = 0, id = -1;
  31. 				for (int j = i + 1; j < n; j++)
  32. 					if (s[j] == t[i])
  33. 						co = 1, id = j;
  34. 				if (co) {
  35. 					res.push_back(pair<int, int>(id, n-1));
  36. 					swap(s[id], t[n-1]);
  37. 					res.push_back(pair<int, int>(i, n-1));
  38. 					swap(s[i], t[n-1]);
  39. 				}
  40. 				else
  41. 				{
  42. 					int co = 0, id = -1;
  43. 					for (int j = i + 1; j < n; j++)
  44. 						if (t[j] == t[i])
  45. 							co = 1, id = j;
  46. 					if (co) {
  47. 						res.push_back(pair<int, int>(i, id));
  48. 						swap(s[i], t[id]);
  49. 					}
  50. 					else
  51. 						break;
  52. 				}
  53. 			}
  54. 		if (s == t) {
  55. 			cout << "Yes\n" << res.size() << "\n";
  56. 			for (int i = 0; i < res.size(); i++)
  57. 				cout << res[i].first +1<< " " << res[i].second +1<< "\n";
  58. 		}
  59. 		else
  60. 			cout << "No\n";
  61. 	}
  62. 	//_getch();
  63. 	return 0;
  64. }
Success #stdin #stdout 0s 4364KB
comments (?)
stdin 
1
6
aabbbb
dddddd
stdout 
Yes
4
1 6
2 5
3 4
5 6
https://ideone.com/eVTzi3
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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