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昨天做修改操作时用到了replace函数--备份表create table ac01_20150105 as select * from ac01;create table ac01_dy_20150105 as select * from ac01_dy;create table cjscrz_2... 阅读全文
摘要:
今天做了数据结构的专项练习 题目是hdu1102 最开始没想明白,一直纠结于怎么把已经有的边并入最小树种题目Problem DescriptionThere are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each other. We say two village A and B are connected, if and only if there is a road between A an 阅读全文