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2553. Separate the Digits in an Array 👍

  • Time: $O(n)$
  • Space: $O(n)$
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class Solution {
 public:
  vector<int> separateDigits(vector<int>& nums) {
    vector<int> ans;

    for (const int num : nums)
      for (const char c : to_string(num))
        ans.push_back(c - '0');

    return ans;
  }
};

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class Solution {
  public int[] separateDigits(int[] nums) {
    List<Integer> ans = new ArrayList<>();

    for (final int num : nums)
      for (final char c : String.valueOf(num).toCharArray())
        ans.add(c - '0');

    return ans.stream().mapToInt(Integer::intValue).toArray();
  }
}

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class Solution:
  def separateDigits(self, nums: list[int]) -> list[int]:
    return [int(c) for num in nums for c in str(num)]