LeetCode 2917: Find the K-or of an Array Solution

Master LeetCode problem 2917 (Find the K-or of an Array), 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.

2917. Find the K-or of an Array

Easy

Array Bit Manipulation

Problem Explanation

Explanation:

To solve this problem, we need to perform bitwise OR operations on the numbers in the input array nums considering the condition of having at least k numbers with a 1 in each bit position. We can achieve this by iterating through each bit position from right to left, and setting the bit in the result if the count of 1s in that position across all numbers is greater than or equal to k.

Initialize a variable result to 0.
Iterate through each bit position from right to left.
For each bit position, count the number of 1s across all numbers in nums.
If the count is greater than or equal to k, set the bit in result.
Finally, return the result.

Time Complexity: O(n * 32) where n is the number of elements in the input array nums. Space Complexity: O(1)

Solution Code

class Solution {
    public int findKthOr(int[] nums, int k) {
        int result = 0;
        for (int i = 31; i >= 0; i--) {
            int count = 0;
            for (int num : nums) {
                if (((num >> i) & 1) == 1) {
                    count++;
                }
            }
            if (count >= k) {
                result |= (1 << i);
            }
        }
        return result;
    }
}

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