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Merge Two Sorted Lists

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Merge Two Sorted Lists** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** Dummy head + compare and append **Edge Cases to Consider:** - (1) Both lists empty - (2) One list empty - (3) Lists of different lengths

Examples

Example 1
Input: [1,2,4], [1,3,4]
Output: [1,1,2,3,4,4]
Explanation: Basic merge
Example 2
Input: [], []
Output: []
Explanation: Both empty
Example 3
Input: [], [0]
Output: [0]
Explanation: First empty

Constraints

  • ▪The number of nodes in the list is in the range [0, 500]
  • ▪-100 <= Node.val <= 100
  • ▪Solve in-place without copying node structures

Watch Out For Edge Cases

  • ▪Both lists empty
  • ▪One list empty
  • ▪Lists of different lengths
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