Lca onhttps://h30306.github.io/blog/zh-tw/tags/lca/Recent content in Lca onHugo -- gohugo.iozh-twhwork0511@gmail.com (Wei Yi Chung)hwork0511@gmail.com (Wei Yi Chung)© 2026 Wei Yi ChungFri, 11 Sep 2026 00:00:00 +0000LeetCode 2509: Cycle Length Queries in a Treehttps://h30306.github.io/blog/zh-tw/leetcode/leetcode-2509/Fri, 11 Sep 2026 00:00:00 +0000hwork0511@gmail.com (Wei Yi Chung)https://h30306.github.io/blog/zh-tw/leetcode/leetcode-2509/LeetCode 2509 解題筆記：完全二元樹的編號，parent 就是 v // 2，比較大的往上爬到 LCALeetCode 865: Smallest Subtree with all the Deepest Nodeshttps://h30306.github.io/blog/zh-tw/leetcode/leetcode-865/Fri, 09 Jan 2026 00:00:00 +0000hwork0511@gmail.com (Wei Yi Chung)https://h30306.github.io/blog/zh-tw/leetcode/leetcode-865/LeetCode 865 解題筆記：BFS 找最後一層再一起往上爬，或一次 DFS 回傳 (深度, 節點)