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]);
}
}
}c++ permutation
The 3! possible permutations with 3 elements:
1 2 4
31 69
1 3 2
2 1 3
2 3 1
3 1 2
3 2 1
After loop: 1 2 3Copyright © 2021 Codeinu
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