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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. void recurse(
  7.   const string &s, unsigned mask = 0, const string &out = string())
  8. {
  9.   size_t n = s.size();
  10.   if (out.size() == n) cout << ' ' << out;
  11.   for (size_t i = 0; i < n; ++i) {
  12.     unsigned bit = 1 << i;
  13.     if (mask & bit) continue;
  14.     recurse(s, mask | bit, out + s[i]);
  15.   }
  16. }
  17.  
  18. int main() {
  19.   string test = "red";
  20.   recurse(test);
  21.   cout << endl;
  22.   return 0;
  23. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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 red rde erd edr dre der
https://ideone.com/6YVBh7
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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