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3394. Minimum Array End

Difficulty: Medium

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3394. Minimum Array End

Medium


You are given two integers n and x. You have to construct an array of positive integers nums of size n where for every 0 <= i < n - 1, nums[i + 1] is greater than nums[i], and the result of the bitwise AND operation between all elements of nums is x.

Return the minimum possible value of nums[n - 1].

 

Example 1:

Input: n = 3, x = 4

Output: 6

Explanation:

nums can be [4,5,6] and its last element is 6.

Example 2:

Input: n = 2, x = 7

Output: 15

Explanation:

nums can be [7,15] and its last element is 15.

 

Constraints:

  • 1 <= n, x <= 108

Solution

class Solution {
    public long minEnd(int n, int x) {
        long current = x;
        while ((n - 1) > 0) {
            n--;
            current = (current + 1) | x;
        }
        return current;
    }
}

Complexity Analysis

  • Time Complexity: O(?)
  • Space Complexity: O(?)

Approach

Detailed explanation of the approach will be added here