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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4.  
  5. void solve(ll t) {
  6. 	string s;
  7.  
  8. 	cin >> s;
  9. 	vector<int> v(26);
  10. 	for (int i = 0; i < s.length(); i++) {
  11. 		v[s[i] - 'a']++;
  12. 	}
  13.  
  14. 	for (int i = 0; i < 26; i++) {
  15. 		if (v[i] > s.length() / 2) {
  16. 			cout << "Case #" << i << ": IMPOSSIBLE" << endl;
  17. 			return;
  18. 		}
  19. 	}
  20. 	string ans;
  21. 	for (int i = 0; i < s.length(); i++) {
  22. 		for (int j = 0; j < 26; j++) {
  23. 			if (v[j] > 0 and s[i] - 'a' != j) {
  24. 				string k {'a' + j};
  25. 				ans += k;
  26. 				v[j]--;
  27. 				break;
  28. 			}
  29. 		}
  30. 	}
  31. 	cout << "Case #" << t << ": " << ans << endl;
  32. }
  33.  
  34.  
  35. int main() {
  36. 	ll t;
  37. 	cin >> t;
  38.  
  39. 	for (int i = 1; i <= t; i++) {
  40. 		solve(i);
  41. 	}
  42. 	return 0;
  43. }
Success #stdin #stdout 0.01s 5620KB
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Case #1: arst
Case #9: IMPOSSIBLE
https://ideone.com/Jb4CCQ
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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