一、先决条件/Prerequisites 在设置 SAP Business One 应用之前,确保您已具备以下各项:Before you set up the SAP Business One app
Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which Note: The input prerequisites is a graph represented by a list of edges, not adjacency matrices. You may assume that there are no duplicate edges in the input prerequisites. (); i++) { mp[prerequisites[i].second][prerequisites[i].first] = 1; in[prerequisites[i].first]++; } int cnt = 0; vector<int> vis(numCourses
/x86_64-w64-mingw32-static --with-mpfr=/c/mingw810/prerequisites/x86_64-w64-mingw32-static --with-mpc =/c/mingw810/prerequisites/x86_64-w64-mingw32-static --with-isl=/c/mingw810/prerequisites/x86_64-w64- /x86_64-zlib-static/include -I/c/mingw810/prerequisites/x86_64-w64-mingw32-static/include' CXXFLAGS=' /x86_64-zlib-static/include -I/c/mingw810/prerequisites/x86_64-w64-mingw32-static/include' CPPFLAGS=' -I/c/mingw810/x86_64-810-posix-seh-rt_v6-rev0/mingw64/opt/include -I/c/mingw810/prerequisites/x86_64
; i++) { 19 graph.get(prerequisites[i][0]).neighbors.add(graph.get(prerequisites[i][1])); 20 ) { 28 if (numCourses <= 1 || prerequisites.length == 0 || prerequisites[0].length == 0) { 29 <= 1 || prerequisites.length == 0 || prerequisites[0].length == 0) { 3 return true; 4 } ; i++) { 14 graph.get(prerequisites[i][0]).add(prerequisites[i][1]); 15 } 16 17 int ; i++) { 16 graph.get(prerequisites[i][0]).add(prerequisites[i][1]); 17 } 18 19 Map<
给你一个数组 prerequisites ,其中 prerequisites[i] = [ai, bi] ,表示在选修课程 ai 前 必须 先选修 bi 。 示例 1: 输入:numCourses = 2, prerequisites = [[1,0]] 输出:[0,1] 解释:总共有 2 门课程。要学习课程 1,你需要先完成课程 0。 示例 2: 输入:numCourses = 4, prerequisites = [[1,0],[2,0],[3,1],[3,2]] 输出:[0,2,1,3] 解释:总共有 4 门课程。 先修课程按数组 prerequisites 给出,其中 prerequisites[i] = [ai, bi] ,表示如果要学习课程 ai 则 必须 先学习课程 bi 。 示例 2: 输入:numCourses = 2, prerequisites = [[1,0],[0,1]] 输出:false 解释:总共有 2 门课程。
先修课程按数组 prerequisites 给出,其中 prerequisites[i] = [ai, bi] ,表示如果要学习课程 ai 则 必须 先学习课程 bi 。 示例 1: 输入:numCourses = 2, prerequisites = [[1,0]] 输出:true 解释:总共有 2 门课程。学习课程 1 之前,你需要完成课程 0 。这是可能的。 提示: 1 <= numCourses <= 10^5 0 <= prerequisites.length <= 5000 prerequisites[i].length == 2 0 <= ai, bi < numCourses prerequisites[i] 中的所有课程对 「互不相同」 思路: 这是一道经典的拓扑排序问题,而拓扑排序就是具有依赖关系的图。 = function(numCourses, prerequisites) { // 如果没有先决依赖,则可以独立学习,直接返回true if (!
/x86_64-w64-mingw32-static --with-mpfr=/c/mingw810/prerequisites/x86_64-w64-mingw32-static --with-mpc =/c/mingw810/prerequisites/x86_64-w64-mingw32-static --with-isl=/c/mingw810/prerequisites/x86_64-w64- /x86_64-zlib-static/include -I/c/mingw810/prerequisites/x86_64-w64-mingw32-static/include' CXXFLAGS=' /x86_64-zlib-static/include -I/c/mingw810/prerequisites/x86_64-w64-mingw32-static/include' CPPFLAGS=' -I/c/mingw810/x86_64-810-win32-seh-rt_v6-rev0/mingw64/opt/include -I/c/mingw810/prerequisites/x86_64
抛砖引玉 思路 之前考虑prerequisites是依赖关系的集合可能包含多个子集, 这样一个prerequisites子集中不相邻的子集即[1,0,2]中1,2的出度入度就不好统计了 看了官方的题解, prerequisites多了限制条件只有两个元素,那统计出度入度就简便了: 对numCourses中任意一门课其包含依赖它的(入度),其依赖的(出度) 统计每个元素入度数量及出度子集 当一个元素的入度数量为 * @return {boolean} */ var canFinish = function (numCourses, prerequisites) { let mapItem = new = prerequisites[i][0], before = prerequisites[i][1], afterValue = mapNum.get(after), ; i++) { let after = prerequisites[i][0], before = prerequisites[i][1], beforeValue =
10005]; int b[10005]; int vis[10005]; bool canFinish(int numCourses, vector<vector<int>>& prerequisites ) { if(numCourses==0||numCourses==1) return true; if(prerequisites.size ()==0) return true; for(int i=0;i<prerequisites.size();i++) { edge[prerequisites[i][1]].push_back(prerequisites[i][0]); a[prerequisites[i][0]]++; b[prerequisites[i][1]]++; } int num=0; while(1) {
Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which Note: The input prerequisites is a graph represented by a list of edges, not adjacency matrices. You may assume that there are no duplicate edges in the input prerequisites. 拓扑排序的裸题。 class Solution { public: bool canFinish(int numCourses, vector<pair<int, int>>& prerequisites) { (); i++) { mp[prerequisites[i].second][prerequisites[i].first] = 1;
int vis[10005]; vector<int> ans; vector<int> findOrder(int numCourses, vector<vector<int>>& prerequisites ) { for(int i=0;i<prerequisites.size();i++) { edge[prerequisites [i][1]].push_back(prerequisites[i][0]); a[prerequisites[i][0]]++; b[prerequisites
先修课程按数组 prerequisites 给出,其中 prerequisites[i] = [ai, bi] ,表示如果要学习课程 ai 则 必须 先学习课程 bi 。 、 示例 1: 输入:numCourses = 2, prerequisites = [[1,0]] 输出:true 解释:总共有 2 门课程。学习课程 1 之前,你需要完成课程 0 。这是可能的。 示例 2: 输入:numCourses = 2, prerequisites = [[1,0],[0,1]] 输出:false 解释:总共有 2 门课程。 class Solution { public: //判断拓扑排序 bool canFinish(int numCourses, vector<vector<int>>& prerequisites ; //存入度为0的点 vector<int> d(numCourses); //存每个序号的入度 //初始化邻接表 for(auto& v : prerequisites
Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which Note: The input prerequisites is a graph represented by a list of edges, not adjacency matrices. You may assume that there are no duplicate edges in the input prerequisites. Solution class Solution { public: bool canFinish(int numCourses, vector<pair<int, int>>& prerequisites ) { vector<unordered_set<int>> graph(numCourses); for(auto it : prerequisites) {
先修课程按数组 prerequisites 给出,其中 prerequisitesi = ai, bi ,表示如果要学习课程 ai 则 必须 先学习课程 bi 。 代码如下: package main import "fmt" func main() { numCourses := 2 prerequisites := [][]int{{1, 0}} ret := canFinish1(numCourses, prerequisites) fmt.Println(ret) } // 一个node,就是一个课程 // name [][]int) bool { if len(prerequisites) == 0 { return true } // 一个编号 对应 一个课的实例 nodes := make(map[int]*Course) for _, arr := range prerequisites { to := arr[0] from
func canFinish(numCourses int, prerequisites [][]int) bool { inverse_adj:=make([][]int,numCourses ) for i:=0;i<len(prerequisites);i++{ inverse_adj[prerequisites[i][1]]=append(inverse_adj[ prerequisites[i][1]],prerequisites[i][0]) } /* # 深度优先遍历,判断结点是否访问过 # 这里要设置 3 个状态 );i++{ //将边缘列表转换成逆邻接矩阵的形式 out_degree[prerequisites[i][0]]++ inverse_adj[prerequisites [i][1]]=append(inverse_adj[prerequisites[i][1]],prerequisites[i][0]) } r:=BFS(inverse_adj,
Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which Note: The input prerequisites is a graph represented by a list of edges, not adjacency matrices. You may assume that there are no duplicate edges in the input prerequisites. Solution class Solution { public: vector<int> findOrder(int numCourses, vector<pair<int, int>>& prerequisites vector<int> res; vector<unordered_set<int>> graph(numCourses); for(auto it : prerequisites
先修课程按数组 prerequisites 给出,其中 prerequisites[i] = [ai, bi] ,表示如果要学习课程 ai 则 必须 先学习课程 bi 。 示例 1: 输入:numCourses = 2, prerequisites = [[1,0]] 输出:true 解释:总共有 2 门课程。学习课程 1 之前,你需要完成课程 0 。这是可能的。 map<int, int> deg; map<int, vector<int>> g; for (auto p : prerequisites) { 给你一个数组 prerequisites ,其中 prerequisites[i] = [ai, bi] ,表示在选修课程 ai 前 必须 先选修 bi 。 示例 1: 输入:numCourses = 2, prerequisites = [[1,0]] 输出:[0,1] 解释:总共有 2 门课程。要学习课程 1,你需要先完成课程 0。
环检测算法(DFS 版本) 先来看看力扣第 207 题「课程表」: 函数签名如下: boolean canFinish(int numCourses, int[][] prerequisites); 所以我们可以根据题目输入的 prerequisites 数组生成一幅类似这样的图: 如果发现这幅有向图中存在环,那就说明课程之间存在循环依赖,肯定没办法全部上完;反之,如果没有环,那么肯定能上完全部课程 函数签名如下: int[] findOrder(int numCourses, int[][] prerequisites); 这里我先说一下拓扑排序(Topological Sorting)这个名词 canFinish(numCourses, prerequisites)) { // 不可能完成所有课程 return new int[]{}; } // 先说环检测算法,直接看 BFS 的解法代码: // 主函数 public boolean canFinish(int numCourses, int[][] prerequisites) { /
Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which Note: The input prerequisites is a graph represented by a list of edges, not adjacency matrices. You may assume that there are no duplicate edges in the input prerequisites. 代码如下: public boolean canFinish(int numCourses, int[][] prerequisites) { List<Integer> graph[] 优化代码如下: public boolean canFinish(int numCourses, int[][] prerequisites) { List<Integer> graph
func canFinish(numCourses int, prerequisites [][]int) bool { inverse_adj:=make([][]int,numCourses ) for i:=0;i<len(prerequisites);i++{ inverse_adj[prerequisites[i][1]]=append(inverse_adj[ prerequisites[i][1]],prerequisites[i][0]) } /* # 深度优先遍历,判断结点是否访问过 # 这里要设置 3 个状态