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Linux-1. 基本命令的基本格式

1 基本命令的基本格式 目录1 基本命令的基本格式1. 命令提示符说明2. 命令的基本格式3. 目录相关的命令3.1 ls 命令3.2 cd 命令3.3 pwd 命令3.4 mkdir 命令3.5 rmdir 命令4. 文件操作相关的命令4.1 touch 命令4.2 stat 命令4.3 cat命令4.4 more 命令4.5 less 命令4.6 head 命令4.7

空间四面体体积公式

int T,n,m; int va[N]; db volume(db x1,db y1,db z1,db x2,db y2,db z2,db x3,db y3,db z3,db x4,db y4,db z4); signed main() { IOS; double x1,y1,z1,x2,y2,z2,x3,y3,z3,x4,y4,z4; cin>>x1>>y1>>z1; cin>>x2>>y2>>z2;

Counting Triangles

题目描述 Goodeat finds an undirected complete graph with n vertices. Each edge of the graph is painted black or white. He wants you to help him find the number of triangles (a, b, c) (a < b < c), such that the edges between (a, b), (b, c), (c, a) have t

Counting Triangles(逆向思维)2021牛客暑期多校训练营3

J. Counting Triangles 题意: ​ (a, b, c) (a < b < c),(a, b), (b, c), (c, a) 三边同时为true or false 计数++ 复盘: ​ a -> b -> c -> a , 形成了一个三角形,首先肯定能想到 n 三次暴力枚举,必然超时,想半天也没什么思路,经队友提醒,首先是无向图(一直拿有向图去写),然后三角形的