LeetCode 2980: Check if Bitwise OR Has Trailing Zeros Solution

Master LeetCode problem 2980 (Check if Bitwise OR Has Trailing Zeros), a easy 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.

2980. Check if Bitwise OR Has Trailing Zeros

Easy

Array Bit Manipulation

Problem Explanation

Explanation:

To solve this problem, we need to find if there exist two or more elements in the given array whose bitwise OR has at least one trailing zero in its binary representation. We can iterate over all pairs of elements in the array and check if their bitwise OR has trailing zeros.

Algorithm:

Initialize a set to store the binary representation of the bitwise OR of all pairs of elements.
Iterate over all pairs of elements in the array and calculate their bitwise OR.
Convert the bitwise OR result to binary representation and check if it has any trailing zeros.
If a pair's bitwise OR has trailing zeros, return true.
If no pair has trailing zeros in its bitwise OR, return false.

Time Complexity: O(n^2) where n is the number of elements in the array.

Space Complexity: O(n) to store the binary representation of the bitwise OR of pairs.

Solution Code

class Solution {
    public boolean checkIfBitwiseORHasTrailingZeros(int[] nums) {
        Set<String> set = new HashSet<>();
        for (int i = 0; i < nums.length; i++) {
            for (int j = i + 1; j < nums.length; j++) {
                int bitwiseOR = nums[i] | nums[j];
                String binary = Integer.toBinaryString(bitwiseOR);
                if (binary.endsWith("0")) {
                    return true;
                }
                set.add(binary);
            }
        }
        return false;
    }
}

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