diff --git a/code/src/main/java/com/raorao/interview/beike/Main.java b/code/src/main/java/com/raorao/interview/beike/Main.java
new file mode 100644
index 00000000..6cec7fa3
--- /dev/null
+++ b/code/src/main/java/com/raorao/interview/beike/Main.java
@@ -0,0 +1,69 @@
+package com.raorao.interview.beike;
+
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.Scanner;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-18-19:53
+ */
+public class Main {
+
+  public static void main(String[] args) {
+    Scanner scanner = new Scanner(System.in);
+    String line1 = scanner.nextLine();
+    String[] items = line1.split(" ");
+    int n = Integer.parseInt(items[0]);
+    int p1 = Integer.parseInt(items[1]);
+    int p2 = Integer.parseInt(items[2]);
+    int p3 = Integer.parseInt(items[3]);
+    int t1 = Integer.parseInt(items[4]);
+    int t2 = Integer.parseInt(items[5]);
+    Interval[] intervals = new Interval[n];
+    for (int i = 0; i < n; i++) {
+      String[] temp = scanner.nextLine().split(" ");
+      intervals[i] = new Interval(Integer.parseInt(temp[0]), Integer.parseInt(temp[1]));
+    }
+    System.out.println(compute(n, p1, p2, p3, t1, t2, intervals));
+
+
+  }
+
+  public static int compute(int n, int p1, int p2, int p3, int t1, int t2, Interval[] intervals) {
+    int count = 0;
+    Arrays.sort(intervals, Comparator.comparingInt(e -> e.end));
+    for (int i = 0; i < n; i++) {
+      count += p1 * (intervals[i].end - intervals[i].start);
+      if (i < n - 1) {
+        count += intevalSum(p1, p2, p3,t1, t2,  intervals[i + 1].start - intervals[i].end);
+      }
+    }
+    return count;
+  }
+
+  public static int intevalSum(int p1, int p2, int p3, int t1, int t2,  int interval) {
+    if (interval <= 0) {
+      return 0;
+    } else if (interval <= t1) {
+      return p1 * interval;
+    } else if (interval <= t1 + t2) {
+      return p1 * t1 + p2 * (interval - t1);
+    } else {
+      return p1 * t1 + p2 * t2 + p3 * (interval - t1 - t2);
+    }
+  }
+
+  static class Interval {
+
+    int end;
+    private int start;
+
+    public Interval(int start, int end) {
+      this.start = start;
+      this.end = end;
+    }
+  }
+}
diff --git a/code/src/main/java/com/raorao/interview/beike/t2/Main.java b/code/src/main/java/com/raorao/interview/beike/t2/Main.java
new file mode 100644
index 00000000..158e95f4
--- /dev/null
+++ b/code/src/main/java/com/raorao/interview/beike/t2/Main.java
@@ -0,0 +1,30 @@
+package com.raorao.interview.beike.t2;
+
+import java.util.Scanner;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-18-20:35
+ */
+public class Main {
+
+  public static void main(String[] args) {
+    Scanner scanner = new Scanner(System.in);
+    int n = Integer.parseInt(scanner.nextLine());
+    String[] line = scanner.nextLine().split(" ");
+    int[] data = new int[n];
+    for (int i = 0; i < n; i++) {
+      data[i] = Integer.parseInt(line[i]);
+    }
+
+    int count = 0;
+    for (int i = 0; i < 5; i++) {
+      for (int j = 0; j < 5; j++) {
+        count += Math.abs(data[i] - data[j]);
+      }
+    }
+    System.out.println(count);
+  }
+}
diff --git a/code/src/main/java/com/raorao/interview/beike/t3/Main.java b/code/src/main/java/com/raorao/interview/beike/t3/Main.java
new file mode 100644
index 00000000..a325278a
--- /dev/null
+++ b/code/src/main/java/com/raorao/interview/beike/t3/Main.java
@@ -0,0 +1,37 @@
+package com.raorao.interview.beike.t3;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-18-20:54
+ */
+public class Main {
+
+  public static void main(String[] args) {
+    String test = "8K67A65K27T59K346AK2";
+    // out = 4;
+
+  }
+
+
+  /**
+   *
+   *   /*
+   *   样例解释
+   * 4轮出牌顺序为：
+   * A234567
+   * 56789T
+   * KKKKA2
+   * 6
+   *
+   *    */
+
+  public static void process(String input) {
+    char[] chars = input.toCharArray();
+    Map<String, Integer> map = new HashMap<>();
+  }
+}
diff --git a/code/src/main/java/com/raorao/interview/bytedance/Test.java b/code/src/main/java/com/raorao/interview/bytedance/Test.java
index 850cebd2..9548796d 100644
--- a/code/src/main/java/com/raorao/interview/bytedance/Test.java
+++ b/code/src/main/java/com/raorao/interview/bytedance/Test.java
@@ -1,5 +1,10 @@
 package com.raorao.interview.bytedance;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.Vector;
+
 /**
  * .
  *
@@ -8,4 +13,9 @@ package com.raorao.interview.bytedance;
  */
 public class Test {
 
+  public static void main(String[] args) {
+    ArrayList a;
+    LinkedList b;
+    Vector v;
+  }
 }
diff --git a/code/src/main/java/com/raorao/leetcode/q406/Solution.java b/code/src/main/java/com/raorao/leetcode/q406/Solution.java
index 489eea0d..a2125944 100644
--- a/code/src/main/java/com/raorao/leetcode/q406/Solution.java
+++ b/code/src/main/java/com/raorao/leetcode/q406/Solution.java
@@ -1,18 +1,38 @@
 package com.raorao.leetcode.q406;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 /**
  * 根据身高和序号重组队列.
  *
+ * 题目描述：一个学生用两个分量 (h, k) 描述，h 表示身高，k 表示排在前面的有 k 个学生的身高比他高或者和他一样高。\
+ *
+ * 思路：贪心算法，为了在每次插入操作时不影响后续的操作，身高较高的学生应该先做插入操作，否则身高较小的学生原先正确插入第 k 个位置可能会变成第 k+1 个位置。
+ *
+ * 身高降序、k 值升序，然后按排好序的顺序插入队列的第 k 个位置中。
+ *
  * @author Xiong Raorao
  * @since 2018-08-17-15:22
  */
 public class Solution {
 
   public static void main(String[] args) {
+    int[][] input = new int[][] {{7, 0}, {4, 4}, {7, 1}, {5, 0}, {6, 1}, {5, 2}};
 
   }
 
-  public int[][] reconstructQueue(int[][] people) {
-    return null;
+    public static int[][] reconstructQueue(int[][] people) {
+    if (people == null || people.length == 0 || people[0].length == 0) {
+      return new int[0][0];
+    }
+    Arrays.sort(people, (a, b) -> a[0] == b[0] ? a[1] - b[1] : b[0] - a[0]); //升序排列就是小的放前面，大的放后面；
+    List<int[]> queue = new ArrayList<>();
+    for (int[] p : people) {
+      queue.add(p[1], p);
+    }
+
+    return queue.toArray(new int[queue.size()][]);
   }
 }