This game takes two words of equal length and sees if it can permute the source word into a the destination word in a certain number of hops. Each hop, the word is only allowed to alter one letter at ...

// where 'n' is the length of 'nums'. // For each number in 'nums', we traverse each position for the permutations to add the number, // with each permutation being O(n!). // Space Complexity : O(n!), ...