Original link:After idea comes down from the clone project on git, it starts to report the error of “unable to find or load the main class”
Recommended method: delete The idea file, restart the idea or directly Maven clean and then Maven installRecommended Today
[NOIP2001 Popularization Group] Seek Ranking
Question analysis: The question mentions the pre-order, in-order, and post-order arrangement of trees, so we need to know what these three arrangements mean first. 3 (depth-first) permutations of binary trees: Pre-order, "root left and right". That is, for each subtree of the binary tree, first visit its root, and then traverse its left and right […]