99. Recover Binary Search Tree

这题提示给的很好, 直接一气呵成  O1空间解决, 一次accept 开心..!!

中英双语解释在此;  这里懒得再写一遍了, 各位麻烦移步

https://leetcode.com/problems/recover-binary-search-tree/discuss/149509/32ms-beat-100-cpp-solution-and-only-15-line-code-with-explanation

原文地址:https://www.cnblogs.com/lychnis/p/9309982.html