├── heap_sort
├── README.md
├── src
│ └── main
│ │ └── java
│ │ └── me
│ │ └── zbl
│ │ └── heapsort
│ │ ├── App.java
│ │ └── HeapSort.java
└── pom.xml
├── bubble_sort
├── README.md
├── src
│ └── main
│ │ └── java
│ │ └── me
│ │ └── zbl
│ │ └── bubblesort
│ │ ├── App.java
│ │ └── BubbleSort.java
└── pom.xml
├── quick_sort
├── README.md
├── src
│ └── main
│ │ └── java
│ │ └── me
│ │ └── zbl
│ │ └── quicksort
│ │ ├── App.java
│ │ └── QuickSort.java
└── pom.xml
├── shells_sort
├── README.md
├── src
│ └── main
│ │ └── java
│ │ └── me
│ │ └── zbl
│ │ └── shellssort
│ │ ├── App.java
│ │ └── ShellsSort.java
└── pom.xml
├── simple_choice_sort
├── README.md
├── src
│ └── main
│ │ └── java
│ │ └── me
│ │ └── zbl
│ │ └── simplechoice
│ │ ├── App.java
│ │ └── SimpleChoiceSort.java
└── pom.xml
├── straight_insertion_sort
├── README.md
├── src
│ └── main
│ │ └── java
│ │ └── me
│ │ └── zbl
│ │ └── straightinsert
│ │ ├── App.java
│ │ └── StraightInserSort.java
└── pom.xml
├── .travis.yml
├── .gitee
├── ISSUE_TEMPLATE.zh-CN.md
└── PULL_REQUEST_TEMPLATE.zh-CN.md
├── README.md
├── .gitignore
├── merge_sort
├── src
│ └── main
│ │ └── java
│ │ └── me
│ │ └── zbl
│ │ └── mergesort
│ │ ├── App.java
│ │ └── MergeSort.java
└── pom.xml
├── pom.xml
└── LICENSE
/heap_sort/README.md:
--------------------------------------------------------------------------------
1 | # 堆排序 ( Heap Sort )
--------------------------------------------------------------------------------
/bubble_sort/README.md:
--------------------------------------------------------------------------------
1 | # 冒泡排序 ( Bubble Sort )
--------------------------------------------------------------------------------
/quick_sort/README.md:
--------------------------------------------------------------------------------
1 | # 快速排序 ( Quick Sort )
--------------------------------------------------------------------------------
/shells_sort/README.md:
--------------------------------------------------------------------------------
1 | # 希尔排序 ( Shell's Sort )
--------------------------------------------------------------------------------
/simple_choice_sort/README.md:
--------------------------------------------------------------------------------
1 | # 简单选择排序 ( Simple Choice Sort )
--------------------------------------------------------------------------------
/straight_insertion_sort/README.md:
--------------------------------------------------------------------------------
1 | # 直接插入排序 ( Straight Insert Sort )
--------------------------------------------------------------------------------
/.travis.yml:
--------------------------------------------------------------------------------
1 | language: java
2 | jdk:
3 | - oraclejdk8
4 | notifications:
5 | email: true
--------------------------------------------------------------------------------
/.gitee/ISSUE_TEMPLATE.zh-CN.md:
--------------------------------------------------------------------------------
1 | ### 该问题是怎么引起的？
2 |
3 |
4 |
5 | ### 重现步骤
6 |
7 |
8 |
9 | ### 报错信息
10 |
11 |
12 |
13 |
14 |
--------------------------------------------------------------------------------
/.gitee/PULL_REQUEST_TEMPLATE.zh-CN.md:
--------------------------------------------------------------------------------
1 | ### 该Pull Request关联的Issue
2 |
3 |
4 | ### 修改描述
5 |
6 |
7 |
8 | ### 测试用例
9 |
10 |
11 |
12 | ### 修复效果的截屏
13 |
14 |
15 |
16 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # algorithm
2 |
3 | [](./LICENSE)
4 | [](https://www.travis-ci.org/JamesZBL/algorithm)
5 |
6 | 常见算法，如查找、排序等
--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | # Compiled class file
2 | *.class
3 |
4 | # Log file
5 | *.log
6 |
7 | # BlueJ files
8 | *.ctxt
9 |
10 | # Mobile Tools for Java (J2ME)
11 | .mtj.tmp/
12 |
13 | # Package Files #
14 | *.jar
15 | *.war
16 | *.ear
17 | *.zip
18 | *.tar.gz
19 | *.rar
20 |
21 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
22 | hs_err_pid*
23 | .idea
24 | *.iml
--------------------------------------------------------------------------------
/heap_sort/src/main/java/me/zbl/heapsort/App.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.heapsort;
18 |
19 | import com.google.common.primitives.Ints;
20 |
21 | /**
22 | * @author JamesZBL
23 | * @date 2018-02-26
24 | */
25 | public class App {
26 |
27 | public static void main(String[] args) {
28 | int[] raw = {5, 4, 1, 2, 7, 6, 9, 8, 0, 3};
29 | HeapSort.sort(raw);
30 | System.out.println(Ints.asList(raw));
31 | }
32 | }
33 |
--------------------------------------------------------------------------------
/quick_sort/src/main/java/me/zbl/quicksort/App.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.quicksort;
18 |
19 | import com.google.common.primitives.Ints;
20 |
21 | /**
22 | * @author JamesZBL
23 | * @date 2018-03-01
24 | */
25 | public class App {
26 |
27 | public static void main(String[] args) {
28 | int[] raw = {5, 4, 1, 2, 7, 6, 9, 8, 0, 3};
29 | QuickSort.sort(raw);
30 | System.out.println(Ints.asList(raw));
31 | }
32 | }
33 |
--------------------------------------------------------------------------------
/bubble_sort/src/main/java/me/zbl/bubblesort/App.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.bubblesort;
18 |
19 | import com.google.common.primitives.Ints;
20 |
21 | /**
22 | * @author JamesZBL
23 | * @date 2018-03-01
24 | */
25 | public class App {
26 |
27 | public static void main(String[] args) {
28 | int[] raw = {5, 4, 1, 2, 7, 6, 9, 8, 0, 3};
29 | BubbleSort.sort(raw);
30 | System.out.println(Ints.asList(raw));
31 | }
32 | }
33 |
--------------------------------------------------------------------------------
/shells_sort/src/main/java/me/zbl/shellssort/App.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.shellssort;
18 |
19 | import com.google.common.primitives.Ints;
20 |
21 | /**
22 | * @author JamesZBL
23 | * @date 2018-02-26
24 | */
25 | public class App {
26 |
27 | public static void main(String[] args) {
28 | int[] raw = {5, 4, 1, 2, 7, 6, 9, 8, 0, 3};
29 | ShellsSort.sort(raw);
30 | System.out.println(Ints.asList(raw));
31 | }
32 | }
33 |
--------------------------------------------------------------------------------
/merge_sort/src/main/java/me/zbl/mergesort/App.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.mergesort;
18 |
19 | import com.google.common.primitives.Ints;
20 |
21 | /**
22 | * 归并排序
23 | *
24 | * @author JamesZBL
25 | * @date 2018-04-01
26 | */
27 | public class App {
28 |
29 | public static void main(String[] args) {
30 | int[] raw = {5, 4, 1, 2, 7, 6, 9, 8, 0, 3};
31 | MergeSort.sort(raw);
32 | System.out.println(Ints.asList(raw));
33 | }
34 | }
35 |
--------------------------------------------------------------------------------
/simple_choice_sort/src/main/java/me/zbl/simplechoice/App.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.simplechoice;
18 |
19 | import com.google.common.primitives.Ints;
20 |
21 | /**
22 | * @author JamesZBL
23 | * @date 2018-02-26
24 | */
25 | public class App {
26 |
27 | public static void main(String[] args) {
28 | int[] raw = {5, 4, 1, 2, 7, 6, 9, 8, 0, 3};
29 | SimpleChoiceSort.sort(raw);
30 | System.out.println(Ints.asList(raw));
31 | }
32 | }
33 |
--------------------------------------------------------------------------------
/straight_insertion_sort/src/main/java/me/zbl/straightinsert/App.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.straightinsert;
18 |
19 | import com.google.common.primitives.Ints;
20 |
21 | /**
22 | * @author JamesZBL
23 | * @date 2018-02-26
24 | */
25 | public class App {
26 |
27 | public static void main(String[] args) {
28 | int[] raw = {5, 4, 1, 2, 7, 6, 9, 8, 0, 3};
29 | StraightInserSort.sort(raw);
30 | System.out.println(Ints.asList(raw));
31 | }
32 | }
33 |
--------------------------------------------------------------------------------
/heap_sort/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 |
21 | algorithm
22 | me.zbl
23 | 1.0-SNAPSHOT
24 |
25 | 4.0.0
26 |
27 | heap_sort
28 |
29 |
30 |
--------------------------------------------------------------------------------
/bubble_sort/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 |
21 | algorithm
22 | me.zbl
23 | 1.0-SNAPSHOT
24 |
25 | 4.0.0
26 |
27 | bubble_sort
28 |
29 |
30 |
--------------------------------------------------------------------------------
/merge_sort/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 |
21 | algorithm
22 | me.zbl
23 | 1.0-SNAPSHOT
24 |
25 | 4.0.0
26 |
27 | merge_sort
28 |
29 |
30 |
--------------------------------------------------------------------------------
/quick_sort/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 |
21 | algorithm
22 | me.zbl
23 | 1.0-SNAPSHOT
24 |
25 | 4.0.0
26 |
27 | quick_sort
28 |
29 |
30 |
--------------------------------------------------------------------------------
/shells_sort/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 |
21 | algorithm
22 | me.zbl
23 | 1.0-SNAPSHOT
24 |
25 | 4.0.0
26 |
27 | shells_sort
28 |
29 |
30 |
--------------------------------------------------------------------------------
/simple_choice_sort/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 |
21 | algorithm
22 | me.zbl
23 | 1.0-SNAPSHOT
24 |
25 | 4.0.0
26 |
27 | simple_choice_sort
28 |
29 |
30 |
--------------------------------------------------------------------------------
/straight_insertion_sort/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 |
21 | algorithm
22 | me.zbl
23 | 1.0-SNAPSHOT
24 |
25 | 4.0.0
26 |
27 | straight_insertion_sort
28 |
29 |
30 |
--------------------------------------------------------------------------------
/bubble_sort/src/main/java/me/zbl/bubblesort/BubbleSort.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.bubblesort;
18 |
19 | /**
20 | * 冒泡排序
21 | *
22 | * @author JamesZBL
23 | * @date 2018-03-01
24 | */
25 | public class BubbleSort {
26 |
27 | public static int[] sort(int[] raw) {
28 | int i = raw.length - 1;
29 | while (i > 0) {
30 | for (int j = 0; j < i; j++) {
31 | if (raw[j] > raw[j + 1]) {
32 | int tmp = raw[j];
33 | raw[j] = raw[j + 1];
34 | raw[j + 1] = tmp;
35 | }
36 | }
37 | i--;
38 | }
39 |
40 | return raw;
41 | }
42 | }
43 |
--------------------------------------------------------------------------------
/straight_insertion_sort/src/main/java/me/zbl/straightinsert/StraightInserSort.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.straightinsert;
18 |
19 | /**
20 | * 直接插入排序
21 | *
22 | * 将数组中的每个元素与其前面已完成排序的元素进行比较，如果后面的比前面的小，则相互交换位置，直至所有元素都比较完成
23 | * 循环 1：遍历数组
24 | * 循环 2：将当前元素与前面所有完成排序的元素进行比较，后面的小则相互交换
25 | *
26 | * @author JamesZBL
27 | * @date 2018-02-26
28 | */
29 | public class StraightInserSort {
30 |
31 | public static int[] sort(int[] raw) {
32 | for (int i = 0; i < raw.length; i++) {
33 | for (int j = i - 1; j > -1; j--) {
34 | if (raw[j] > raw[j + 1]) {
35 | int tmp = raw[j];
36 | raw[j] = raw[j + 1];
37 | raw[j + 1] = tmp;
38 | }
39 | }
40 | }
41 | return raw;
42 | }
43 | }
44 |
--------------------------------------------------------------------------------
/simple_choice_sort/src/main/java/me/zbl/simplechoice/SimpleChoiceSort.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.simplechoice;
18 |
19 | /**
20 | * 简单选择排序
21 | *
22 | * a.从待排序序列中，找到关键字最小的元素
23 | * b.如果最小元素不是待排序序列的第一个元素，将其和第一个元素互换
24 | * 从余下的 N - 1 个元素中，找出关键字最小的元素，重复 a、b，直到排序结束
25 | * 循环 1：依次遍历序列当中的每一个元素
26 | * 循环 2：将遍历得到的当前元素依次与余下的元素进行比较，符合最小元素的条件，则交换
27 | *
28 | * @author JamesZBL
29 | * @date 2018-02-26
30 | */
31 | public class SimpleChoiceSort {
32 |
33 | public static int[] sort(int[] raw) {
34 | for (int i = 0; i < raw.length; i++) {
35 | for (int j = i; j < raw.length; j++) {
36 | if (raw[j] < raw[i]) {
37 | int tmp = raw[i];
38 | raw[i] = raw[j];
39 | raw[j] = tmp;
40 | }
41 | }
42 | }
43 | return raw;
44 | }
45 | }
46 |
--------------------------------------------------------------------------------
/shells_sort/src/main/java/me/zbl/shellssort/ShellsSort.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.shellssort;
18 |
19 | /**
20 | * 希尔排序
21 | *
22 | * 将待排序数组按照步长 span 进行分组，然后将每组的元素利用直接插入排序的方法进行排序，
23 | * 每次将 span 折半减小，循环上述操作，
24 | * 当 span =1 时，利用直接插入，完成排序
25 | *
26 | *
27 | * 循环 1：将步长依次折半，对序列进行分组，直到步长为 1
28 | * 循环 2、3：即直接插入排序所需要的两次循环
29 | *
30 | * @author JamesZBL
31 | * @date 2018-02-26
32 | */
33 | public class ShellsSort {
34 |
35 | public static int[] sort(int[] raw) {
36 | int span = raw.length / 2;
37 | while (span >= 1) {
38 | for (int i = span; i < raw.length; i++) {
39 | for (int j = i; j - span > -1; j -= span) {
40 | if (raw[j - span] > raw[j]) {
41 | int tmp = raw[j - span];
42 | raw[j - span] = raw[j];
43 | raw[j] = tmp;
44 | }
45 | }
46 | }
47 | span /= 2;
48 | }
49 | return raw;
50 | }
51 | }
52 |
--------------------------------------------------------------------------------
/pom.xml:
--------------------------------------------------------------------------------
1 |
2 |
17 |
20 | 4.0.0
21 |
22 | me.zbl
23 | algorithm
24 | pom
25 | 1.0-SNAPSHOT
26 |
27 | straight_insertion_sort
28 | shells_sort
29 | simple_choice_sort
30 | heap_sort
31 | bubble_sort
32 | quick_sort
33 | merge_sort
34 |
35 |
36 |
37 |
38 |
39 | com.google.guava
40 | guava
41 | 24.0-jre
42 |
43 |
44 |
45 |
46 |
--------------------------------------------------------------------------------
/quick_sort/src/main/java/me/zbl/quicksort/QuickSort.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.quicksort;
18 |
19 | /**
20 | * 快速排序
21 | *
22 | * @author JamesZBL
23 | * @date 2018-03-01
24 | */
25 | public class QuickSort {
26 |
27 | /**
28 | * 排序
29 | *
30 | * @param raw 无序序列
31 | */
32 | public static int[] sort(int[] raw) {
33 | quickSort(raw, 0, raw.length - 1);
34 | return raw;
35 | }
36 |
37 | /**
38 | * 递归分治
39 | *
40 | * @param raw 无序序列
41 | * @param start 左端点位置
42 | * @param end 右端点位置
43 | */
44 | public static void quickSort(int[] raw, int start, int end) {
45 | int pivot = divide(raw, start, end);
46 | if (start < pivot) {
47 | quickSort(raw, start, pivot - 1);
48 | }
49 | if (pivot < end) {
50 | quickSort(raw, pivot + 1, end);
51 | }
52 | }
53 |
54 | /**
55 | * 分治
56 | *
57 | * @param raw 无序序列
58 | * @param start 左端点位置
59 | * @param end 右端点位置
60 | *
61 | * @return 枢轴位置
62 | */
63 | private static int divide(int[] raw, int start, int end) {
64 | int pivot = raw[start];
65 | while (start < end) {
66 | while (start < end && raw[end] >= pivot) {
67 | end--;
68 | }
69 | raw[start] = raw[end];
70 | while (start < end && raw[start] <= pivot) {
71 | start++;
72 | }
73 | raw[end] = raw[start];
74 | }
75 | raw[start] = pivot;
76 | return start;
77 | }
78 | }
79 |
--------------------------------------------------------------------------------
/merge_sort/src/main/java/me/zbl/mergesort/MergeSort.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.mergesort;
18 |
19 | /**
20 | * 归并排序
21 | *
22 | * @author JamesZBL
23 | * @date 2018-04-01
24 | */
25 | public class MergeSort {
26 |
27 | /**
28 | * 归并排序
29 | *
30 | * @param raw 待排序列
31 | *
32 | * @return 有序序列
33 | */
34 | public static int[] sort(int[] raw) {
35 | divideAndSort(raw, 0, raw.length - 1, new int[raw.length]);
36 | return raw;
37 | }
38 |
39 | /**
40 | * 合并序列 raw[start...center] 与序列[center+1...end]
41 | *
42 | * @param raw 序列
43 | * @param start 起始位置
44 | * @param center 中间位置
45 | * @param end 结束位置
46 | * @param temp 临时序列
47 | */
48 | private static void mergeArray(int[] raw, int start, int center, int end, int[] temp) {
49 | int i = start, j = center + 1;
50 | int k = 0;
51 |
52 | // 循环依次取两序列中较小的值
53 | while (i <= center && j <= end) {
54 | if (raw[i] < raw[j]) {
55 | temp[k++] = raw[i++];
56 | } else {
57 | temp[k++] = raw[j++];
58 | }
59 | }
60 |
61 | // 检查左序列是否剩余
62 | while (i <= center) {
63 | temp[k++] = raw[i++];
64 | }
65 |
66 | // 检查右序列是否剩余
67 | while (j <= end) {
68 | temp[k++] = raw[j++];
69 | }
70 |
71 | // 使序列 raw[start...end] 有序
72 | for (int ii = 0; ii < k; ii++) {
73 | raw[start + ii] = temp[ii];
74 | }
75 | }
76 |
77 | /**
78 | * 递归分治
79 | *
80 | * @param raw 待排序列
81 | * @param start 起始位置
82 | * @param end 结束位置
83 | * @param temp 临时序列
84 | */
85 | private static void divideAndSort(int[] raw, int start, int end, int[] temp) {
86 | if (start < end) {
87 | // 计算中间位置
88 | int center = (start + end) / 2;
89 | // 做序列排序
90 | divideAndSort(raw, start, center, temp);
91 | // 右序列排序
92 | divideAndSort(raw, center + 1, end, temp);
93 | // 合并左右序列
94 | mergeArray(raw, start, center, end, temp);
95 | }
96 | }
97 | }
98 |
--------------------------------------------------------------------------------
/heap_sort/src/main/java/me/zbl/heapsort/HeapSort.java:
--------------------------------------------------------------------------------
1 | /*
2 | * Copyright 2018 JamesZBL
3 | *
4 | * Licensed under the Apache License, Version 2.0 (the "License");
5 | * you may not use this file except in compliance with the License.
6 | * You may obtain a copy of the License at
7 | *
8 | * http://www.apache.org/licenses/LICENSE-2.0
9 | *
10 | * Unless required by applicable law or agreed to in writing, software
11 | * distributed under the License is distributed on an "AS IS" BASIS,
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 | * See the License for the specific language governing permissions and
14 | * limitations under the License.
15 | *
16 | */
17 | package me.zbl.heapsort;
18 |
19 | /**
20 | * 堆排序
21 | *
22 | * 先将数组构造成大顶堆
23 | * a.取出当前大顶堆的根节点，将其与序列末尾元素进行交换；此时：序列末尾的元素为已排序的最大值；由于交换了元素，
24 | * 当前位于根节点的堆并不一定满足大顶堆的性质
25 | * b.对交换后的 n-1 个序列元素进行调整，使其满足大顶堆的性质
26 | * 循环 a、b，直到堆中只剩下 1 个元素
27 | *
28 | * 一般的，升序排列用大顶堆，降序排列用小顶堆
29 | *
30 | * @author JamesZBL
31 | * @date 2018-02-26
32 | */
33 | public class HeapSort {
34 |
35 | /**
36 | * 排序
37 | *
38 | * @param raw 待排序数组
39 | */
40 | public static int[] sort(int[] raw) {
41 | getMaxHeap(raw);
42 | for (int i = raw.length - 1; i > 0; i--) {
43 | int tmp = raw[0];
44 | raw[0] = raw[i];
45 | raw[i] = tmp;
46 | adjust(raw, 0, i);
47 | }
48 | return raw;
49 | }
50 |
51 |
52 | /**
53 | * 将序列排序形成大顶堆
54 | *
55 | * @param raw 待处理数组
56 | */
57 | private static int[] getMaxHeap(int[] raw) {
58 | for (int i = raw.length / 2; i > -1; i--) {
59 | adjust(raw, i, raw.length - 1);
60 | }
61 | return raw;
62 | }
63 |
64 | /**
65 | * 对树中的某个节点进行调整
66 | * 先将堆顶元素值保存，依次对各节点进行调整
67 | *
68 | * @param raw 待调整树
69 | * @param root 调整的位置
70 | * @param length 树节点总数
71 | */
72 | private static int[] adjust(int[] raw, int root, int length) {
73 | int tmp = raw[root];
74 | int child = leftIndex(root);
75 | while (child < length) {
76 | if (child + 1 < length && raw[child] < raw[child + 1]) {
77 | child++;
78 | }
79 | if (tmp >= raw[child]) {
80 | break;
81 | }
82 | raw[root] = raw[child];
83 | root = child;
84 | child *= 2;
85 | child++;
86 | }
87 | raw[root] = tmp;
88 | return raw;
89 | }
90 |
91 | /**
92 | * 获取左子节点的位置
93 | *
94 | * @param i 在堆中的位置序号
95 | *
96 | * @return i 位置的元素的左子节点的位置序号
97 | */
98 | private static int leftIndex(int i) {
99 | return 2 * i + 1;
100 | }
101 |
102 | /**
103 | * 获取左子节点的位置
104 | *
105 | * @param i 在堆中的位置序号
106 | *
107 | * @return i 位置的元素的左子节点的位置序号
108 | */
109 | private static int rightIndex(int i) {
110 | return 2 * i + 2;
111 | }
112 | }
113 |
--------------------------------------------------------------------------------
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