modify code on class

src/class10/Code01_BFS.java

@@ -7,14 +7,14 @@ import java.util.Queue;
 public class Code01_BFS {
 
 	// 从node出发，进行宽度优先遍历
-	public static void bfs(Node node) {
+	public static void bfs(Node start) {
-		if (node == null) {
+		if (start == null) {
 			return;
 		}
 		Queue<Node> queue = new LinkedList<>();
 		HashSet<Node> set = new HashSet<>();
-		queue.add(node);
+		queue.add(start);
-		set.add(node);
+		set.add(start);
 		while (!queue.isEmpty()) {
 			Node cur = queue.poll();
 			System.out.println(cur.value);

src/class10/Code02_DFS.java

@@ -27,5 +27,8 @@ public class Code02_DFS {
 			}
 		}
 	}
+	
+	
+	
 
 }

src/class10/Code03_TopologicalOrderDFS2.java

@@ -54,10 +54,16 @@ public class Code03_TopologicalOrderDFS2 {
 		return ans;
 	}
 
+	// 当前来到cur点，请返回cur点所到之处，所有的点次！
+	// 返回（cur，点次）
+	// 缓存！！！！！order   
+	//  key : 某一个点的点次，之前算过了！
+	//  value : 点次是多少
 	public static Record f(DirectedGraphNode cur, HashMap<DirectedGraphNode, Record> order) {
 		if (order.containsKey(cur)) {
 			return order.get(cur);
 		}
+		// cur的点次之前没算过！
 		long nodes = 0;
 		for (DirectedGraphNode next : cur.neighbors) {
 			nodes += f(next, order).nodes;

src/class10/Code03_TopologySort.java

@@ -10,7 +10,9 @@ public class Code03_TopologySort {
 
 	// directed graph and no loop
 	public static List<Node> sortedTopology(Graph graph) {
+		// key 某个节点   value 剩余的入度
 		HashMap<Node, Integer> inMap = new HashMap<>();
+		// 只有剩余入度为0的点，才进入这个队列
 		Queue<Node> zeroInQueue = new LinkedList<>();
 		for (Node node : graph.nodes.values()) {
 			inMap.put(node, node.in);

src/class10/Code04_Kruskal.java

@@ -83,6 +83,7 @@ public class Code04_Kruskal {
 	public static Set<Edge> kruskalMST(Graph graph) {
 		UnionFind unionFind = new UnionFind();
 		unionFind.makeSets(graph.nodes.values());
+		// 从小的边到大的边，依次弹出，小根堆！
 		PriorityQueue<Edge> priorityQueue = new PriorityQueue<>(new EdgeComparator());
 		for (Edge edge : graph.edges) { // M 条边
 			priorityQueue.add(edge);  // O(logM)

src/class10/Code05_Prim.java

@@ -23,7 +23,11 @@ public class Code05_Prim {
 
 		// 哪些点被解锁出来了
 		HashSet<Node> nodeSet = new HashSet<>();
+		
+		
+		
 		Set<Edge> result = new HashSet<>(); // 依次挑选的的边在result里
+
 		for (Node node : graph.nodes.values()) { // 随便挑了一个点
 			// node 是开始点
 			if (!nodeSet.contains(node)) {

src/class10/Code06_Dijkstra.java

@@ -10,15 +10,17 @@ public class Code06_Dijkstra {
 	public static HashMap<Node, Integer> dijkstra1(Node from) {
 		HashMap<Node, Integer> distanceMap = new HashMap<>();
 		distanceMap.put(from, 0);
+		// 打过对号的点
 		HashSet<Node> selectedNodes = new HashSet<>();
 		Node minNode = getMinDistanceAndUnselectedNode(distanceMap, selectedNodes);
 		while (minNode != null) {
+			//  原始点  ->  minNode(跳转点)   最小距离distance
 			int distance = distanceMap.get(minNode);
 			for (Edge edge : minNode.edges) {
 				Node toNode = edge.to;
 				if (!distanceMap.containsKey(toNode)) {
 					distanceMap.put(toNode, distance + edge.weight);
-				} else {
+				} else { // toNode 
 					distanceMap.put(edge.to, Math.min(distanceMap.get(toNode), distance + edge.weight));
 				}
 			}

src/class10/GraphGenerator.java

@@ -5,13 +5,17 @@ public class GraphGenerator {
 	// matrix 所有的边
 	// N*3 的矩阵
 	// [weight, from节点上面的值，to节点上面的值]
-	public static Graph createGraph(Integer[][] matrix) {
+	// 
+	// [ 5 , 0 , 7]
+	// [ 3 , 0,  1]
+	// 
+	public static Graph createGraph(int[][] matrix) {
 		Graph graph = new Graph();
-		for (int i = 0; i < matrix.length; i++) { 
+		for (int i = 0; i < matrix.length; i++) {
-			// matrix[0][0], matrix[0][1]  matrix[0][2]
+			 // 拿到每一条边， matrix[i] 
-			Integer weight = matrix[i][0];
+			int weight = matrix[i][0];
-			Integer from = matrix[i][1];
+			int from = matrix[i][1];
-			Integer to = matrix[i][2];
+			int to = matrix[i][2];
 			if (!graph.nodes.containsKey(from)) {
 				graph.nodes.put(from, new Node(from));
 			}

src/class10/Node.java

@@ -2,7 +2,7 @@ package class10;
 
 import java.util.ArrayList;
 
-// 点结构的描述  A  0
+// 点结构的描述
 public class Node {
 	public int value;
 	public int in;

src/class11/Code06_ConvertToLetterString.java

@@ -34,38 +34,9 @@ public class Code06_ConvertToLetterString {
 			return res;
 		}
 		return process(str, i + 1);
-	}
+	}	
-	
-	public static int dpWays2(String s) {
-		if (s == null || s.length() == 0) {
-			return 0;
-		}
-		char[] str = s.toCharArray();
-		int N = str.length;
-		int[] dp = new int[N+1];
-		dp[N] = 1;
-		for(int i = N-1; i >= 0; i--) {
-			if (str[i] == '0') {
-				dp[i] = 0;
-			}
-			if (str[i] == '1') {
-				dp[i] = dp[i + 1];
-				if (i + 1 < str.length) {
-					dp[i] += dp[i + 2];
-				}
-			}
-			if (str[i] == '2') {
-				dp[i] = dp[i + 1];
-				if (i + 1 < str.length && (str[i + 1] >= '0' && str[i + 1] <= '6')) {
-					dp[i] += dp[i + 2]; // (i和i+1)作为单独的部分，后续有多少种方法
-				}
-			}
-		}
-		return dp[0];
-	}
-	
 
-	public static int dpWays(String s) {
+	public static int dp(String s) {
 		if (s == null || s.length() == 0) {
 			return 0;
 		}
@@ -94,8 +65,8 @@ public class Code06_ConvertToLetterString {
 	}
 
 	public static void main(String[] args) {
-		System.out.println(number("11111"));
+		System.out.println(number("2132082"));
-		System.out.println(dpWays2("11111"));
+		System.out.println(dp("2132082"));
 	}
 
 }