Backtracking – permutation generate




// C++ program to print all 
// permutations with duplicates allowed 
#include  
using namespace std; 


// Function to print permutations of string 
// This function takes three parameters: 
// 1. String 
// 2. Starting index of the string 
// 3. Ending index of the string. 
void permute(string a, int l, int r) 
{ 
	// Base case 
	if (l == r) 
		cout<

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