单源最短路径-Bellman-Ford算法

发布一个k8s部署视频：https://edu.youkuaiyun.com/course/detail/26967

课程内容：各种k8s部署方式。包括minikube部署，kubeadm部署，kubeasz部署，rancher部署，k3s部署。包括开发测试环境部署k8s，和生产环境部署k8s。

腾讯课堂连接地址https://ke.qq.com/course/478827?taid=4373109931462251&tuin=ba64518

第二个视频发布  https://edu.youkuaiyun.com/course/detail/27109

腾讯课堂连接地址https://ke.qq.com/course/484107?tuin=ba64518

介绍主要的k8s资源的使用配置和命令。包括configmap，pod，service，replicaset，namespace，deployment，daemonset，ingress，pv，pvc，sc，role，rolebinding，clusterrole，clusterrolebinding，secret，serviceaccount，statefulset，job，cronjob，podDisruptionbudget，podSecurityPolicy,networkPolicy,resourceQuota，limitrange，endpoint，event，conponentstatus，node，apiservice，controllerRevision等。

第三个视频发布：https://edu.youkuaiyun.com/course/detail/27574

详细介绍helm命令，学习helm chart语法，编写helm chart。深入分析各项目源码，学习编写helm插件
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package com.data.struct;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.Set;

public class BellmanFord {
	private Node [][]graphic;
	private Node s;
	private Set<Node> nextNodes=new HashSet<Node>();
	private Set<Node> addList=new HashSet<Node>();
	private Set<Node> removeList=new HashSet<Node>();
	
	public BellmanFord(int v,int e){
		graphic=new Node[v][v];
		for(int i=0;i<e;i++){
			int v1=new Random().nextInt(v);
			int v2=new Random().nextInt(v);
			Node node=new Node();
			node.d=Integer.MAX_VALUE-1000;
			node.w=new Random().nextInt(e);
			node.start=v1;
			node.end=v2;
			graphic[v1][v2]=node;
		}
		for(int i=0;i<v;i++){
			if(graphic[i][i]==null){
				Node node=new Node();
				node.d=Integer.MAX_VALUE-1000;
				node.w=new Random().nextInt(e);
				node.start=i;
				node.end=i;
				graphic[i][i]=node;
			}
		}
		s=graphic[0][0];
		s.d=0;
	}
	
	public void relex(Node u,Node v){
		if(graphic[v.end][v.end].d>u.d+graphic[u.start][v.start].w){
			graphic[v.end][v.end].d=u.d+graphic[u.start][v.start].w;
			graphic[v.end][v.end].parent=u;
			addList.add(graphic[v.end][v.end]);
			System.out.println(graphic[v.end][v.end].start+"=>"+u.start);
		}
	}
	
	public boolean bellmanFord(){
		nextNodes.add(s);
		for(int k=0;k<graphic.length;k++){
			if(k!=s.start&&graphic[s.start][k]!=null){
				relex(s,graphic[k][k]);
			}
		}
		nextNodes.addAll(addList);
		nextNodes.remove(s);
		while(nextNodes.size()>0){
			addList.clear();removeList.clear();
			Iterator<Node> it=nextNodes.iterator();
			while(it.hasNext()){
				Node node=it.next();
				for(int k=0;k<graphic.length;k++){
					if(k!=node.start&&graphic[node.start][k]!=null){
						relex(node,graphic[k][k]);
					}
				}
				removeList.add(node);
			}
			nextNodes.removeAll(removeList);
			nextNodes.addAll(addList);
			
		}

		for(int j=0;j<graphic.length;j++){
			for(int k=0;k<graphic.length;k++){
				if(j!=k){
					if(graphic[j][k]!=null&&graphic[k][k].d> graphic[j][j].d+graphic[j][k].w){
						return false;
					}
				}
			}
		}
		return true;
		
	}
	
	public void  print(){
		for(int i=0;i<graphic.length;i++){
			for(int j=0;j<graphic[i].length;j++){
				if(graphic[i][j]==null){
					System.out.print(-1+"|"+-1+"|"+-1+"  ");
				}else{
					System.out.print(graphic[i][j].start+"|"+graphic[i][j].end+"|"+graphic[i][j].w+"  ");
				}
				
			}
			System.out.println();
		}
	}
	
	public void printPath(){
		List<Integer> indexList=new ArrayList<Integer>();
		List<Integer> removeList=new ArrayList<Integer>();
		List<Integer> addList=new ArrayList<Integer>();
		indexList.add(0);
		while(indexList.size()>0){
			removeList.clear();
			addList.clear();
			for(int x=0;x<indexList.size();x++){
				int l=indexList.get(x);
				removeList.add(l);
				for(int j=0;j<graphic.length;j++){
					if(graphic[j][j].parent==graphic[l][l]){
						graphic[l][l].children.add(graphic[j][j]);
						addList.add(j);
					}
				}
				
			}
			indexList.removeAll(removeList);
			indexList.addAll(addList);
		}
		
		Node h = this.s;
        this.print(0, h,h);
            
		
		
		System.out.println();
	}

	     
 private void print(int level,Node parent, Node node){
     for (int i = 0; i < level; i++) {
         System.out.format(" ");
     }
     System.out.format("|");
     if(parent!=node){
    	 System.out.print("("+graphic[parent.start][node.end].w+")");
	     for (int i = 0; i < level; i++) {
	         System.out.format("-");
	     }
     }else{
    	 for (int i = 0; i < level; i++) {
	         System.out.format("-");
	     }
     }
     
     System.out.format("%d%n", node.start);
     List<Node> children = node.children;
     for(int i=0;i<children.size();i++){
    	 print(level+1,node,children.get(i));
     }
               
 }
	
	private class Node{
		private int d;
		private int w;
		private int start;
		private int end;
		private Node parent;
		private List<Node> children=new ArrayList<Node>();
	}

	public static void main(String[] args) {
		BellmanFord b=new BellmanFord(5,20);
		b.print();
		System.out.println(b.bellmanFord());
		b.printPath();

	}

}