LeetCode 2625: Flatten Deeply Nested Array Solution

Problem Explanation

Explanation:

To flatten a deeply nested array up to a certain depth n, we can use a recursive approach. We iterate through the elements of the array, and if an element is an array and the current depth is less than n, we recursively flatten that sub-array. If the depth reaches n, we simply add the element as is to the flattened array.

Algorithm:
1. Initialize an empty list to store the flattened array.
2. Iterate through each element in the input array:
  - If the element is an array and the current depth < n, recursively flatten the sub-array with depth + 1.
  - Otherwise, add the element to the flattened array.
3. Return the flattened array.
Time Complexity: O(N), where N is the total number of elements in the input array.
Space Complexity: O(N), for the recursive call stack.

Solution Code

class Solution {
    public List<Object> flattenArray(Object[] arr, int n) {
        List<Object> flattened = new ArrayList<>();
        for (Object element : arr) {
            if (element instanceof Object[] && n > 0) {
                flattened.addAll(flattenArray((Object[]) element, n - 1));
            } else {
                flattened.add(element);
            }
        }
        return flattened;
    }
}

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2625. Flatten Deeply Nested Array