Destroying The Graph Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 8198 Accepted: 2635 Special Judge Description Alice and Bob play the following game. First, Alice draws some directed graph with N vertices and M arcs. After that B…
覆盖索引通常都是复合索引,即索引字段为多个.创建索引时应该注意索引排列顺序. Sql Server检索应用索引时,字段识别顺序为 从左到右. 例如如下索引的使用上 Create NONCLUSTERED Index IX_Student_Name_Class_Sex On tb_Student(Name,Class,Sex) Select * From tb_Student as s where s.Name='ws' //可以使用 Select * From tb_Student as s…
一.安装 gcov:是随gcc一起发布的,并不需要独立安装:lcov:其他博客说是随ltp发布的,结果下载下ltp之后编译了10多分钟,最后也没见lcov,最后到sourceforge下载了lcov单独的代码: wget http://ncu.dl.sourceforge.net/project/ltp/Coverage Analysis/LCOV-1.12/lcov-1.12.tar.gz tar -zxvf lcov-1.12.tar.gz make make install 二.使用 以h…