Baekjoon 27440 “Make it One 3” is a problem that asks for the minimum number of operations needed to reduce a very large integer up to 10^18 to 1 using three operations (divide by 3, divide by 2, subtract 1). Since the input range reaches 10^18, the standard dynamic programming approach (O(N) time, O(N) space) is infeasible. The problem must be solved efficiently using a recursive recurrence relation and hash map-based memoization, achieving O(log² n) time complexity. ...

Structure of Git Timestamps Git’s timestamp system was designed to record two separate times from when Linus Torvalds designed Git in 2005. This was because in Linux kernel development, the time a patch was written and the time it was actually committed could differ. AuthorDate and CommitDate Git commits have two timestamps. AuthorDate represents when the code was first written, meaning when the original author made the change. It is set via the git commit --date option or the GIT_AUTHOR_DATE environment variable. ...