8.28

code/src/main/java/com/raorao/interview/haoweilai/t1/Main.java

@@ -0,0 +1,38 @@
+package com.raorao.interview.haoweilai.t1;
+
+import java.util.Scanner;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-28-19:01
+ */
+public class Main {
+
+  public static void main(String[] args) {
+    Scanner scanner = new Scanner(System.in);
+    String input = scanner.nextLine();
+    System.out.println(process(input));
+  }
+
+  private static int process(String str) {
+    if (str == null || str.length() == 0) {
+      return 0;
+    }
+    if(str.length() == 1 && Integer.parseInt(str) == 0){
+      return 1;
+    }
+    int len = str.length();
+    int count = 0;
+    int sum = 0;
+    for (int i = 0; i < len; i++) {
+      sum += str.charAt(i) - '0';
+      if (sum % 3 == 0) {
+        count++;
+        sum = 0;
+      }
+    }
+    return count;
+  }
+}

code/src/main/java/com/raorao/interview/haoweilai/t1/Main2.java

@@ -0,0 +1,47 @@
+package com.raorao.interview.haoweilai.t1;
+
+import java.util.Scanner;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-28-19:01
+ */
+public class Main2 {
+
+  public static void main(String[] args) {
+    Scanner scanner = new Scanner(System.in);
+    String input = scanner.nextLine();
+    System.out.println(process(input));
+  }
+
+
+  private static boolean isOk(String input, int start, int end) {
+    int k = 0;
+    for (int i = start; i < end; i++) {
+      k = 10 * k + input.charAt(i) - '0';
+    }
+    return (k % 3 == 0);
+  }
+
+  private static int process(String str) {
+    if (str == null || str.length() == 0) {
+      return 0;
+    }
+    int len = str.length();
+    int[] v = new int[len + 1];
+    for (int i = 1; i <= len; i++) {
+      int j = i - 1;
+      while (!isOk(str, j, i) && j > 0) {
+        j--;
+      }
+      if (isOk(str, j, i)) {
+        v[i] = Math.max(v[i - 1], v[j] + 1);
+      } else {
+        v[i] = v[i - 1];
+      }
+    }
+    return v[len];
+  }
+}

code/src/main/java/com/raorao/interview/haoweilai/t2/Main.java

@@ -0,0 +1,47 @@
+package com.raorao.interview.haoweilai.t2;
+
+import java.util.Scanner;
+
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-28-19:12
+ */
+public class Main {
+
+  public static void main(String[] args) {
+    Scanner scanner = new Scanner(System.in);
+    int t = Integer.parseInt(scanner.nextLine());
+    int[] res = new int[t];
+    int[][] input = new int[t][2];
+    for (int i = 0; i < t; i++) {
+      String[] tmp = scanner.nextLine().split(" ");
+      input[i][0] = Integer.parseInt(tmp[0]);
+      input[i][1] = Integer.parseInt(tmp[1]);
+    }
+    for (int i = 0; i < t; i++) {
+      res[i] = process(input[i][0], input[i][1]);
+    }
+    for (int i = 0; i < res.length; i++) {
+      System.out.println(res[i]);
+    }
+
+  }
+
+  private static int process(int x, int k) {
+    int y = 1;
+    while (k > 0) {
+      boolean bool = x + y == (x | y);
+      if (bool) {
+        y++;
+        k--;
+      } else {
+        y++;
+      }
+    }
+    return y-1;
+  }
+
+}

code/src/main/java/com/raorao/interview/haoweilai/t3/Main.java

@@ -0,0 +1,56 @@
+package com.raorao.interview.haoweilai.t3;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-28-19:57
+ */
+public class Main {
+
+  public static void main(String[] args) {
+    int[] arr = new int[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+    int[] bool = new int[] {0, 1, 1, 1, 1, 1, 1, 1, 1, 0};
+    process(arr, bool);
+  }
+
+  private static void process(int[] arr, int[] bool) {
+    List<String> res = new ArrayList<>();
+    List<int[]> boolList = new ArrayList<>();
+
+    List<Integer> zeros = new ArrayList<>();
+    for (int i = 0; i < bool.length; i++) {
+      if (bool[i] == 0) {
+        zeros.add(i);
+      }
+    }
+
+    back(zeros,bool, boolList, 0);
+
+    for (int i = 0; i < boolList.size(); i++) {
+      StringBuilder sb = new StringBuilder();
+      for (int j = 0; j < boolList.get(i).length; j++) {
+        if (bool[j] == 1) {
+          sb.append(arr[j]);
+        }
+      }
+      res.add(sb.toString());
+    }
+    res.forEach(e -> System.out.println(e));
+  }
+
+  private static void back(List<Integer> zeros, int[] bool, List<int[]> res, int k) {
+
+  }
+
+  private static int[] arrCopy(int[] arr) {
+    int n = arr.length;
+    int[] res = new int[n];
+    System.arraycopy(arr, 0, res, 0, n);
+    return res;
+  }
+
+}

code/src/main/java/com/raorao/interview/haoweilai/t4/Main.java

@@ -0,0 +1,32 @@
+package com.raorao.interview.haoweilai.t4;
+
+import java.util.Scanner;
+
+/**
+ * .
+ *
+ * @author Xiong Raorao
+ * @since 2018-08-28-20:47
+ */
+public class Main {
+
+  public static void main(String[] args) {
+    Scanner scanner = new Scanner(System.in);
+    String[] line1 = scanner.nextLine().split(" ");
+    int n = Integer.parseInt(line1[0]);
+    int m = Integer.parseInt(line1[1]);
+    String[] line2 = scanner.nextLine().split(" ");
+    int[] score = new int[n];
+    for (int i = 0; i < n; i++) {
+      score[i] = Integer.parseInt(line2[i]);
+    }
+
+    float sum = 0, k;
+    for (int i = 0; i < n; i++) {
+      sum += score[i];
+    }
+    sum /= n - m;
+    System.out.printf("%.2f", sum);
+  }
+
+}

code/src/main/java/com/raorao/java/A.java

@@ -1,5 +1,10 @@
 package com.raorao.java;
 
+import io.netty.buffer.ByteBuf;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Arrays;
+
 /**
  * .
  *
@@ -8,4 +13,24 @@ package com.raorao.java;
  */
 public class A {
 
+  public static void main(String[] args) {
+    ByteBuffer bb = ByteBuffer.wrap(new byte[12]);
+
+    bb.asCharBuffer().put("abcdef");
+    System.out.println(Arrays.toString(bb.array()));
+
+    // 反转缓冲区
+    bb.rewind();
+    // 设置字节存储次序
+    bb.order(ByteOrder.BIG_ENDIAN);
+    bb.asCharBuffer().put("abcdef");
+    System.out.println(Arrays.toString(bb.array()));
+
+    // 反转缓冲区
+    bb.rewind();
+    // 设置字节存储次序
+    bb.order(ByteOrder.LITTLE_ENDIAN);
+    bb.asCharBuffer().put("abcdef");
+    System.out.println(Arrays.toString(bb.array()));
+  }
 }