2020 change

Author: Junyan

src/main/java/org/zjy/learn/code/amazon/FindSongs.java

@@ -2,18 +2,104 @@
 
 import org.zjy.learn.util.Application;
 
-@Application(time = "06/17/2019 15:08")
+import java.util.*;
+import java.util.stream.Collectors;
+
+@Application(time = "05/13/2020 18:08")
 public class FindSongs implements Runnable {
     /**
      * Two sum. 要求找到sum是target-30，并且其中一首歌曲是符合要求的pairs里单首最长的pair
      * 一个坑，随时update结果pair，保存在一个variable里。因为如果两首歌一样长并且这两首诗最终答案，如果只keep合格的最长的歌曲，最后再retrieve index，会导致这种test case出错。
      */
     @Override
     public void run() {
-
+//    List<String> result = popularNFeatures(
+//                5,
+//                2,
+//                new ArrayList<>(Arrays.asList("anacell", "betacellular", "cetracular", "deltacellular", "eurocell")),
+//                3,
+//                new ArrayList<>(Arrays.asList("Best services provided by anacell", "betacellular has great services", "anacell provides much better services than all other")));
+//
+//        System.out.println(result);
     }
 
     private int[] findSongs(int[] songs) {
         return null;
     }
+
+    private class Node {
+        String word;
+        int sum;
+
+        Node(String s, int size) {
+            word = s;
+            sum = size;
+        }
+    }
+
+    // METHOD SIGNATURE BEGINS, THIS METHOD IS REQUIRED
+    public ArrayList<String> popularNFeatures(int numFeatures,
+                                              int topFeatures,
+                                              List<String> possibleFeatures,
+                                              int numFeatureRequests,
+                                              List<String> featureRequests)
+    {
+        // WRITE YOUR CODE HERE
+        Set<String> possibleSet = new HashSet<>(possibleFeatures);
+        Map<String, Node> map = new HashMap<>();
+        for (String request : featureRequests) {
+            String[] split = request.split("\\s*[^a-zA-Z]+\\s*");
+            if (split.length == 0)
+                continue;
+            Set<String> set = new HashSet<>(Arrays.asList(split));
+            for (String word : set) {
+                if (possibleSet.contains(word)) {
+                    Node node = map.getOrDefault(word, new Node(word, 0));
+                    ++node.sum;
+                    map.put(word, node);
+                }
+            }
+        }
+        PriorityQueue<Node> pq = new PriorityQueue<>(new Comparator<Node>() {
+            public int compare(Node n1, Node n2) {
+                if (n1.sum == n2.sum)
+                    return n2.word.compareTo(n1.word);
+                return n1.sum - n2.sum;
+            }
+        });
+        for (String s : map.keySet()) {
+            pq.offer(map.get(s));
+            if (pq.size() > topFeatures)
+                pq.poll();
+        }
+        ArrayList<String> result = new ArrayList<>();
+        while (!pq.isEmpty()) {
+            Node node = pq.poll();
+            result.add(node.word);
+        }
+        Collections.reverse(result);
+        return result.stream()
+                .map(String::toLowerCase).collect(Collectors.toCollection(ArrayList::new));
+    }
+
+    // METHOD SIGNATURE BEGINS, THIS METHOD IS REQUIRED
+    public List<String> reorderLines(int logFileSize, List<String> logLines)
+    {
+        // WRITE YOUR CODE HERE
+        Collections.sort(logLines, (a, b) -> {
+            String[] split1 = a.split(" ", 2);
+            String[] split2 = b.split(" ", 2);
+            boolean isDigit1 = Character.isDigit(split1[1].charAt(0));
+            boolean isDigit2 = Character.isDigit(split2[1].charAt(0));
+            if(!isDigit1 && !isDigit2) {
+                int comp = split1[1].compareTo(split2[1]);
+                if(comp != 0)
+                    return comp;
+                else
+                    return split1[0].compareTo(split2[0]);
+            }
+            return isDigit1 ? (isDigit2 ? 0 : 1) : -1;
+        });
+        return logLines;
+    }
 }

src/main/java/org/zjy/learn/code/google/MatrixWiredIterator.java

@@ -0,0 +1,34 @@
+package org.zjy.learn.code.google;
+
+import org.zjy.learn.util.Application;
+
+@Application(time = "06/04/2020 13:15")
+public class MatrixWiredIterator implements Runnable {
+    @Override
+    public void run() {
+        int[][] matrix = new int[][]{
+                {1,2,3,4},
+                {5,1,2,3},
+                {6,5,1,2},
+                {7,6,5,1},
+        };
+        matrixIterator(matrix);
+    }
+    // 矩阵斜着遍历
+    private void matrixIterator(int[][] matrix) {
+        int n = matrix[0].length;
+        int m = matrix.length;
+        for (int d = 1; d < n; d++) {
+            for (int l = 0; l < m - d; l++) {
+                int r = l + d;
+                System.out.println(matrix[l][r]);
+            }
+        }
+//        for (int d = 1; d < n; d++) {
+//            for (int r = m - d; r > 0; r--) {
+//                int l = r - d + 1;
+//                System.out.println(matrix[l][r]);
+//            }
+//        }
+    }
+}