CREATE materialized view mv_LoginUsertest1 refresh fast start with sysdate next sysdate + 1/1440for updateas select * from LoginUser@UserMdb;CREATE OR REPLACE materialized view mv_Login
思路:这道题目最难的地方在题意的理解,尤其是密匙是如何生成的,将拗口的密匙生成过程说明如下,分为两个步骤:1.对密匙进行去重;2.对密匙根据字母表剩余字母进行补齐,保证最后的密匙一定是26个字母。代码:#include #include #include using namespace std;void encrypt(string key,string d