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find all permutations of a string Code Example
python all permutations of a string 
>>> from itertools import permutations
>>> perms = [''.join(p) for p in permutations('stack')]
>>> perms
Source: stackoverflow.com
find all permutations of a string 
void permute(string a, int l, int r)  
{  
    // Base case  
    if (l == r)  
        cout<<a<<endl;  
    else
    {  
        // Permutations made  
        for (int i = l; i <= r; i++)  
        {  
  
            // Swapping done  
            swap(a[l], a[i]);  
  
            // Recursion called  
            permute(a, l+1, r);  
  
            //backtrack  
            swap(a[l], a[i]);  
        }  
    }  
}
how to print all permutations of a string 
void permutation(string s)
{
    sort(s.begin(),s.end());
	do{
		cout << s << " ";
	}
    while(next_permutation(s.begin(),s.end()); // std::next_permutation
    
    cout << endl;
}
find permutations 
void find_permutations(vector<int> &array, size_t index, vector<int> current_perm, vector<vector<int>> &res){
    if(index == array.size()) 
        res.push_back(current_perm);
    else{
        for(size_t i = 0; i <= current_perm.size(); ++i){
            vector<int> new_perm(current_perm.begin(), current_perm.end());
            new_perm.insert(new_perm.begin()+i, array[index]);
            find_permutations(array, index+1, new_perm, res);
        }
    }
}
Source: practice.geeksforgeeks.org



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