LeetCode 3094: Guess the Number Using Bitwise Questions II Solution

Master LeetCode problem 3094 (Guess the Number Using Bitwise Questions II), a medium 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.

3094. Guess the Number Using Bitwise Questions II

Medium

Bit Manipulation Interactive

Problem Explanation

Explanation:

This problem involves guessing a hidden number within a given range using bitwise questions. The task is to implement a function findNumber(int n) that will return the number to guess. We can use bitwise operations to find the number efficiently.

Initialize a variable result as 0.
Iterate through each bit position from 0 to 30 (since the hidden number is within the range [0, 2^31-1]).
For each bit position, we will ask bitwise questions to find the number:
- For each question, we set the bit at the current position to 1 and all other bits to 0.
- Check if the answer is greater or equal to the number with the bit set at that position. If true, set the bit at that position in result to 1.
Return the calculated result.

Time Complexity: O(31) = O(1)
Space Complexity: O(1)

Solution Code

public int findNumber(int n) {
    int result = 0;
    for (int i = 0; i < 31; i++) {
        int bit = 1 << i;
        int answer = guess(i, bit);
        if (answer >= n) {
            result |= bit;
        }
    }
    return result;
}

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