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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const int Mod=1e9+7;
  5. const ll INF = 10000000000000;
  6. const int N = 1e6+7;
  7.  
  8.     void solve() {
  9.        int n;
  10.        cin >> n;
  11.        string s;
  12.        cin >> s;
  13.        vector<int> freq(26,0);
  14.        for(int i=0;i<n;i++) freq[s[i]-'a']++;
  15.        char last = '?';
  16.        for(int i=0;i<n;i++){
  17.         bool ok = false;
  18.          for(int j=0;j<26 && !ok;j++){
  19.             if(freq[j]>0 && j+'a'!=last){
  20.                 cout << (char)(j+'a');
  21.                 last=(char)(j+'a');
  22.                 freq[j]--;
  23.                 ok=true;
  24.             }
  25.          }   
  26.          if(!ok){
  27.             for(int j=0;j<26;j++){
  28.                 if(freq[j]>0){
  29.                     cout << (char)(j+'a');
  30.                     freq[j]--;
  31.                     break;    
  32.                 }
  33.             }
  34.          }
  35.        }
  36.        cout << '\n';
  37.     }
  38.  
  39. int main(){ 
  40.     ios::sync_with_stdio(false);
  41.     cin.tie(nullptr);
  42.  
  43.     int t;
  44.     cin >> t;
  45.     while (t--) solve();
  46.  
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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5
3
abc
5
edddf
6
turtle
8
pppppppp
10
codeforces
stdout
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abc
dedfd
elrtut
pppppppp
cdcefeoros
https://ideone.com/rw5yuT
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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