Leetcode #2755: Deep Merge of Two Objects
In this guide, we solve Leetcode #2755 Deep Merge of Two Objects in Python and focus on the core idea that makes the solution efficient.
You will see the intuition, the step-by-step method, and a clean Python implementation you can use in interviews.
Problem Statement
Given two values obj1 and obj2, return a deepmerged value. Values should be deepmerged according to these rules: If the two values are objects, the resulting object should have all the keys that exist on either object.
Quick Facts
- Difficulty: Medium
- Premium: Yes
- Tags: JavaScript
Intuition
The constraints allow a direct scan that keeps only the essential state.
By translating the requirements into a clean loop, the logic stays easy to reason about.
Approach
Iterate through the data once, updating the state needed to compute the answer.
Return the final state after the traversal is complete.
Steps:
- Parse the input.
- Iterate and update state.
- Return the computed answer.
Example
Input: obj1 = {"a": 1, "c": 3}, obj2 = {"a": 2, "b": 2}
Output: {"a": 2, "c": 3, "b": 2}
Explanation: The value of obj1["a"] changed to 2 because if both objects have the same key and their value is not an array or object then we change the obj1 value to the obj2 value. Key "b" with value was added to obj1 as it doesn't exist in obj1.
Python Solution
# TODO: add Python solution
Complexity
The time complexity is O(n). The space complexity is O(1) to O(n).
Edge Cases and Pitfalls
Watch for boundary values, empty inputs, and duplicate values where applicable. If the problem involves ordering or constraints, confirm the invariant is preserved at every step.
Summary
This Python solution focuses on the essential structure of the problem and keeps the implementation interview-friendly while meeting the constraints.