2553. Separate the Digits in an Array LeetCode Solution
In this guide, you will get 2553. Separate the Digits in an Array LeetCode Solution with the best time and space complexity. The solution to Separate the Digits in an Array problem is provided in various programming languages like C++, Java, and Python. This will be helpful for you if you are preparing for placements, hackathons, interviews, or practice purposes. The solutions provided here are very easy to follow and include detailed explanations.
Table of Contents
- Problem Statement
- Complexity Analysis
- Separate the Digits in an Array solution in C++
- Separate the Digits in an Array solution in Java
- Separate the Digits in an Array solution in Python
- Additional Resources

Problem Statement of Separate the Digits in an Array
Given an array of positive integers nums, return an array answer that consists of the digits of each integer in nums after separating them in the same order they appear in nums.
To separate the digits of an integer is to get all the digits it has in the same order.
For example, for the integer 10921, the separation of its digits is [1,0,9,2,1].
Example 1:
Input: nums = [13,25,83,77]
Output: [1,3,2,5,8,3,7,7]
Explanation:
– The separation of 13 is [1,3].
– The separation of 25 is [2,5].
– The separation of 83 is [8,3].
– The separation of 77 is [7,7].
answer = [1,3,2,5,8,3,7,7]. Note that answer contains the separations in the same order.
Example 2:
Input: nums = [7,1,3,9]
Output: [7,1,3,9]
Explanation: The separation of each integer in nums is itself.
answer = [7,1,3,9].
Constraints:
1 <= nums.length <= 1000
1 <= nums[i] <= 105
Complexity Analysis
- Time Complexity: O(n)
- Space Complexity: O(n)
2553. Separate the Digits in an Array LeetCode Solution in C++
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;
}
};
/* code provided by PROGIEZ */
2553. Separate the Digits in an Array LeetCode Solution in Java
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();
}
}
// code provided by PROGIEZ
2553. Separate the Digits in an Array LeetCode Solution in Python
class Solution:
def separateDigits(self, nums: list[int]) -> list[int]:
return [int(c) for num in nums for c in str(num)]
# code by PROGIEZ
Additional Resources
- Explore all LeetCode problem solutions at Progiez here
- Explore all problems on LeetCode website here
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