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  1.  
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4. #define ll long long
  5. #define endl '\n'
  6. ll N = 1e9+7;
  7. ll oo =1e13;
  8. const ll maxx = 1000000 + 3;
  9. ll n,m,k,q,x,y,z,l,r,mid,ans;
  10. string s;
  11. map<char,ll>mp;
  12. unordered_set<string>ss;
  13.  
  14. void go(string s1) {
  15.     if (s1.size() == s.size()) {
  16.         ss.insert(s1);
  17.         return;
  18.     }
  19.  
  20.     for (ll i=0;i<s.size();i++) {
  21.         if (mp[s[i]] == 0)continue;
  22.         mp[s[i]]--;
  23.         go(s1+s[i]);
  24.         mp[s[i]] ++;
  25.     }
  26.  
  27. }
  28. void solve() {
  29.     cin>>s;
  30.     for (char c:s){mp[c]++;}
  31.     go("");
  32.  
  33.     ll size=ss.size();
  34.     cout<<size<<endl;
  35.     vector<string>v(ss.begin(),ss.end());
  36.     sort(v.begin(),v.end());
  37.     for (auto &it:v)cout<<it<<endl;
  38. }
  39. int main() {
  40.     ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
  41.     ll t=1 ;
  42.     // cin >>t;
  43.     while (t--) {
  44.         ans=0;
  45.         solve();
  46.     }
  47. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/P66YwJ
language:
C++ (gcc 8.3)
created:
12 hours ago
visibility:
public

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