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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define FAST ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  4. typedef long long ll;
  5.  
  6. set<string> strs;
  7. void combine(string& n,int indx){
  8.     if(indx==n.size()){
  9.         strs.insert(n);
  10.         return;
  11.     }
  12.     for (int i = indx; i < n.size(); i++) {
  13.         swap(n[indx], n[i]);      
  14.         combine(n, indx + 1);    
  15.         swap(n[indx], n[i]);     
  16.     }
  17.  
  18. }
  19.  
  20.  
  21. int main() {
  22.     FAST
  23.     string n;
  24.     cin >> n;
  25.     combine(n,0);
  26.     cout << strs.size() << "\n";
  27.     for(const auto& s:strs){
  28.         cout<< s << "\n";
  29.     }
  30.     // system("pause");
  31.     return 0;
  32. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/SECJNC
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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