LeetCode 3782 | Last Remaining Integer After Alternating Deletion Operations

In this video, we solve LeetCode 3782: Last Remaining Integer After Alternating Deletion Operations using an efficient mathematical approach. Because n can be as large as 10¹⁵, a brute-force or simulation approach will not work. Instead, we track the gap, direction, and remaining count to compute the answer in O(log n) time and O(1) space.