Permutations Leetcode Solution

The problem Permutations Leetcode Solution provides a simple sequence of integers and asks us to return a complete vector or array of all the permutations of the given sequence. So, before going into solving the problem. We should be familiar with permutations. So, a permutation is nothing but an arrangement of given integers. So, when we say that we need all the permutations of a sequence. We mean that we are required to print or return all possible arrangements of the given sequence. Let's take a look at a few examples for better understanding.

Given sequence:

Permutations: ,,,,,]

 

Explanation: All the ways that you can write 1, 2, 3 in a sequence have been given as output. There are a total of 6 ways to write 1, 2, 3 in a permutation.

 

,]

Explanation: There are only 2 ways possible to write 0, 1.

Backtracking Approach for Permutations Leetcode Solution

 

The problem Permutations Leetcode Solution asked us to generate all the permutations of the given sequence. Generally, we are required to generate a permutation or some sequence recursion is the key to go. But here the recursion or backtracking is a bit tricky. One way could have been picking an element from unpicked elements and placing it at the end of the answer. This way generate a permutation and somehow make sure to remember that this permutation has been generated and should not be repeated. But instead of doing this, we try to find a simple way to perform the task.

 

www.tutorialcup.com/leetcode-solutions/permutations-leetc...

Done