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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void combination(string s, int l, int r) {
  5.     if (l == r) {
  6.         for (auto g : s) {
  7.             cout << g << " ";
  8.         }
  9.         cout << endl;
  10.         return;
  11.     }
  12.  
  13.     for (int i = l; i <= r; i++) {
  14.         swap(s[i], s[l]);
  15.         combination(s, l + 1, r);
  16.         swap(s[i], s[l]); // backtrack
  17.     }
  18. }
  19.  
  20. int main() {
  21.     string s;
  22.     cin >> s;
  23.  
  24.     int l = 0;
  25.     int r = s.size() - 1;   // last index
  26.  
  27.     combination(s, l, r);
  28.  
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
copy 
abc
stdout
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a b c 
a c b 
b a c 
b c a 
c b a 
c a b
https://ideone.com/XeaFs8
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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