LeetCode 2691: Immutability Helper Solution

Master LeetCode problem 2691 (Immutability Helper), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2691. Immutability Helper

Hard

Problem Explanation

Explanation

To implement the Immutability Helper, we can create a class that encapsulates the current state of an object and provides methods to make immutable updates to this object. We can use a combination of deep copying and updating the copied object to achieve immutability.

The algorithmic idea involves creating a copy of the original object, then updating the copied object with the new values. This approach ensures that the original object remains unchanged, and any modifications are applied to the copied object. This way, we can maintain immutability while making updates to the object's state.

Time Complexity

Creating a deep copy of the object: O(N), where N is the number of elements in the object.
Updating the copied object with new values: O(1) for each update operation.

Space Complexity

Creating a deep copy of the object: O(N), where N is the number of elements in the object.
Additional space for storing the copied object: O(N).

Solution Code

import java.util.HashMap;
import java.util.Map;

public class ImmutabilityHelper {
    private Map<String, Object> state;

    public ImmutabilityHelper(Map<String, Object> initialState) {
        this.state = new HashMap<>(initialState);
    }

    public ImmutabilityHelper update(String key, Object value) {
        Map<String, Object> newState = new HashMap<>(this.state);
        newState.put(key, value);
        return new ImmutabilityHelper(newState);
    }

    public Map<String, Object> getState() {
        return this.state;
    }

    public static void main(String[] args) {
        Map<String, Object> initialState = new HashMap<>();
        initialState.put("key1", "value1");
        initialState.put("key2", "value2");

        ImmutabilityHelper helper = new ImmutabilityHelper(initialState);
        ImmutabilityHelper updatedHelper = helper.update("key2", "new_value");

        System.out.println(helper.getState());
        System.out.println(updatedHelper.getState());
    }
}

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