Find the minimum sum of two numbers formed using all digits of an array. Sort the array, build numbers from alternate digits, and add them for the result. The smallest digits take the most significant positions. This ensures an optimal sum. Example: Input [6, 8, 4, 5, 2, 3, 0] gives output "604".
For more details, visit the GeeksforGeeks article: Minimum sum of two numbers formed from digits of an array.