文档解释ORA-12196:TNS:receivedanerrorfromTNSCause:ThenavigationlayerreceivedanerrorfromTNS.Action:SeetheerrorlogfileforthespecificTNSerror.ORA-12196：TNS：从TNS接收到一个错误...

文档解释ORA-02196:PERMANENT/TEMPORARYoptionalreadyspecifiedCause:InCREATETABLESPACE,thePERMANENTand/orTEMPORARYoptionswerespecifiedmorethanonce.Action:NoneORA-02196...

文档解释Errornumber:MY-012196;Symbol:ER_IB_MSG_371;SQLSTATE:HY000Message:%s错误ER_IB_MSG_371，也可称为MySQL错误MY-012196，表示MySQL出现了语法错误。它以SQLSTATE值HY000出现，表示MySQL无法继续操作。常见案例...

解题思路：求出树的直径的两个端点。则树上每一个节点到其它点的最远距离一定是到这两个端点的距离中最长的那一个。#include<iostream>#include<cstring>#include<cstdlib>#include<cstdio>#include<cm...