Leetcode Problem 47. Permutations II

47. Permutations II

Leetcode Solutions

Build a hash table (counter) to count the occurrences of each number in the input array.
Define a backtracking function that takes the current combination and the counter as arguments.
If the current combination's length is equal to the input array's length, add it to the result list.
Iterate over the keys in the counter.
If the count of a number is greater than 0, add it to the current combination and decrease its count in the counter.
Recursively call the backtracking function with the new combination and updated counter.
After the recursive call, backtrack by removing the last added number from the combination and restoring its count in the counter.
Continue this process until all unique permutations are generated.
Return the result list containing all unique permutations.

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