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In this approach, we begin by constructing an array where each element is initialized to the given value of x. We then increment each subsequent element by 1 ensuring that it is greater than the previous element. We stop when we've constructed an array of size n.
This works because the bitwise AND of all numbers will still be x, since all elements are derived from x and only the last element needs to change significantly to ensure uniqueness and satisfy the increasing property.
Time Complexity: O(1)
Space Complexity: O(1)
The function calculates the minimum possible value of the last element by starting with x and incrementing it by n - 1 to ensure all previous n-1 elements are strictly increasing starting from x.
In this approach, we consider constructing the array by leveraging the bitwise properties to ensure the AND operation returns x. We create the first n-1 elements as numbers starting from x incrementally, and ensure the last element is the smallest number fitting the need for bitwise AND to be x.
To optimize the last number's structure, we can explore modifying bits in consideration of the upcoming elements and control zeroed bits strategically to adjust value and ensure valid returns upon AND calculation.
Time Complexity: O(n)
Space Complexity: O(1)
1#include <stdio.h>
2
3int minimumArrayEnd(int n, int x) {
4 int high_possible_val = x;
5 for (int i = 1; i < n; i++) {
6 high_possible_val |= (1 << i);
7 }
8 return high_possible_val;
9}
10
11int main() {
12 int n = 3, x = 4;
13 printf("%d\n", minimumArrayEnd(n, x));
14 return 0;
15}This C code uses bit manipulation to construct the minimum end element. By setting the suitable bits, we obtain potential n-1 lower bits set to create a higher value that preserves higher x values, exploiting AND product properties.