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algorithmzuo 2 years ago
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commit 1ceabcf714
4 changed files with 206 additions and 605 deletions
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102
体系学习班/class08/Code01_Trie.java
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package class08;
public class Code01_Trie {
// 测试链接 : https://leetcode.cn/problems/implement-trie-ii-prefix-tree/
// 提交Trie类可以直接通过
// 原来代码是对的，但是既然找到了直接测试的链接，那就直接测吧
// 这个链接上要求实现的功能和课上讲的完全一样
// 该前缀树的路用数组实现
class Trie {
class Node {
public int pass;
public int end;
public Node[] nexts;
public Node() {
pass = 0;
end = 0;
nexts = new Node[26];
}
}
private Node root;
public Trie() {
root = new Node();
}
public void insert(String word) {
if (word == null) {
return;
}
char[] str = word.toCharArray();
Node node = root;
node.pass++;
int path = 0;
for (int i = 0; i < str.length; i++) { // 从左往右遍历字符
path = str[i] - 'a'; // 由字符，对应成走向哪条路
if (node.nexts[path] == null) {
node.nexts[path] = new Node();
}
node = node.nexts[path];
node.pass++;
}
node.end++;
}
public void erase(String word) {
if (countWordsEqualTo(word) != 0) {
char[] chs = word.toCharArray();
Node node = root;
node.pass--;
int path = 0;
for (int i = 0; i < chs.length; i++) {
path = chs[i] - 'a';
if (--node.nexts[path].pass == 0) {
node.nexts[path] = null;
return;
}
node = node.nexts[path];
}
node.end--;
}
}
public int countWordsEqualTo(String word) {
if (word == null) {
return 0;
}
char[] chs = word.toCharArray();
Node node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = chs[i] - 'a';
if (node.nexts[index] == null) {
return 0;
}
node = node.nexts[index];
}
return node.end;
}
public int countWordsStartingWith(String pre) {
if (pre == null) {
return 0;
}
char[] chs = pre.toCharArray();
Node node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = chs[i] - 'a';
if (node.nexts[index] == null) {
return 0;
}
node = node.nexts[index];
}
return node.pass;
}
}
}

299
体系学习班/class08/Code01_TrieTree.java
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@ -1,299 +0,0 @@
package class08;
import java.util.HashMap;
// 该程序的对数器跑不过，你能发现bug在哪吗？
public class Code01_TrieTree {
// 前缀树节点类型
public static class Node1 {
public int pass;
public int end;
public Node1[] nexts;
public Node1() {
pass = 0;
end = 0;
nexts = new Node1[26];
}
}
public static class Trie1 {
private Node1 root;
public Trie1() {
root = new Node1();
}
public void insert(String word) {
if (word == null) {
return;
}
char[] chs = word.toCharArray();
Node1 node = root;
node.pass++;
int index = 0;
for (int i = 0; i < chs.length; i++) { // 从左往右遍历字符
index = chs[i] - 'a'; // 由字符，对应成走向哪条路
if (node.nexts[index] == null) {
node.nexts[index] = new Node1();
}
node = node.nexts[index];
node.pass++;
}
node.end++;
}
public void delete(String word) {
if (search(word) != 0) {
char[] chs = word.toCharArray();
Node1 node = root;
node.pass--;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = chs[i] - 'a';
if (--node.nexts[index].pass == 0) {
node.nexts[index] = null;
return;
}
node = node.nexts[index];
}
node.end--;
}
}
// word这个单词之前加入过几次
public int search(String word) {
if (word == null) {
return 0;
}
char[] chs = word.toCharArray();
Node1 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = chs[i] - 'a';
if (node.nexts[index] == null) {
return 0;
}
node = node.nexts[index];
}
return node.end;
}
// 所有加入的字符串中，有几个是以pre这个字符串作为前缀的
public int prefixNumber(String pre) {
if (pre == null) {
return 0;
}
char[] chs = pre.toCharArray();
Node1 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = chs[i] - 'a';
if (node.nexts[index] == null) {
return 0;
}
node = node.nexts[index];
}
return node.pass;
}
}
public static class Node2 {
public int pass;
public int end;
public HashMap<Integer, Node2> nexts;
public Node2() {
pass = 0;
end = 0;
nexts = new HashMap<>();
}
}
public static class Trie2 {
private Node2 root;
public Trie2() {
root = new Node2();
}
public void insert(String word) {
if (word == null) {
return;
}
char[] chs = word.toCharArray();
Node2 node = root;
node.pass++;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
node.nexts.put(index, new Node2());
}
node = node.nexts.get(index);
node.pass++;
}
node.end++;
}
public void delete(String word) {
if (search(word) != 0) {
char[] chs = word.toCharArray();
Node2 node = root;
node.pass--;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (--node.nexts.get(index).pass == 0) {
node.nexts.remove(index);
return;
}
node = node.nexts.get(index);
}
node.end--;
}
}
// word这个单词之前加入过几次
public int search(String word) {
if (word == null) {
return 0;
}
char[] chs = word.toCharArray();
Node2 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
return 0;
}
node = node.nexts.get(index);
}
return node.end;
}
// 所有加入的字符串中，有几个是以pre这个字符串作为前缀的
public int prefixNumber(String pre) {
if (pre == null) {
return 0;
}
char[] chs = pre.toCharArray();
Node2 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
return 0;
}
node = node.nexts.get(index);
}
return node.pass;
}
}
public static class Right {
private HashMap<String, Integer> box;
public Right() {
box = new HashMap<>();
}
public void insert(String word) {
if (!box.containsKey(word)) {
box.put(word, 1);
} else {
box.put(word, box.get(word) + 1);
}
}
public void delete(String word) {
if (box.containsKey(word)) {
if (box.get(word) == 1) {
box.remove(word);
} else {
box.put(word, box.get(word) - 1);
}
}
}
public int search(String word) {
if (!box.containsKey(word)) {
return 0;
} else {
return box.get(word);
}
}
public int prefixNumber(String pre) {
int count = 0;
for (String cur : box.keySet()) {
if (cur.startsWith(pre)) {
count++;
}
}
return count;
}
}
// for test
public static String generateRandomString(int strLen) {
char[] ans = new char[(int) (Math.random() * strLen) + 1];
for (int i = 0; i < ans.length; i++) {
int value = (int) (Math.random() * 6);
ans[i] = (char) (97 + value);
}
return String.valueOf(ans);
}
// for test
public static String[] generateRandomStringArray(int arrLen, int strLen) {
String[] ans = new String[(int) (Math.random() * arrLen) + 1];
for (int i = 0; i < ans.length; i++) {
ans[i] = generateRandomString(strLen);
}
return ans;
}
public static void main(String[] args) {
int arrLen = 100;
int strLen = 20;
int testTimes = 100000;
for (int i = 0; i < testTimes; i++) {
String[] arr = generateRandomStringArray(arrLen, strLen);
Trie1 trie1 = new Trie1();
Trie2 trie2 = new Trie2();
Right right = new Right();
for (int j = 0; j < arr.length; j++) {
double decide = Math.random();
if (decide < 0.25) {
trie1.insert(arr[j]);
trie2.insert(arr[j]);
right.insert(arr[j]);
} else if (decide < 0.5) {
trie1.delete(arr[j]);
trie2.delete(arr[j]);
right.delete(arr[j]);
} else if (decide < 0.75) {
int ans1 = trie1.search(arr[j]);
int ans2 = trie2.search(arr[j]);
int ans3 = right.search(arr[j]);
if (ans1 != ans2 || ans2 != ans3) {
System.out.println("Oops!");
}
} else {
int ans1 = trie1.prefixNumber(arr[j]);
int ans2 = trie2.prefixNumber(arr[j]);
int ans3 = right.prefixNumber(arr[j]);
if (ans1 != ans2 || ans2 != ans3) {
System.out.println("Oops!");
}
}
}
}
System.out.println("finish!");
}
}

104
体系学习班/class08/Code02_Trie.java
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package class08;
import java.util.HashMap;
public class Code02_Trie {
// 测试链接 : https://leetcode.cn/problems/implement-trie-ii-prefix-tree/
// 提交Trie类可以直接通过
// 原来代码是对的，但是既然找到了直接测试的链接，那就直接测吧
// 这个链接上要求实现的功能和课上讲的完全一样
// 该前缀树的路用哈希表实现
class Trie {
class Node {
public int pass;
public int end;
public HashMap<Integer, Node> nexts;
public Node() {
pass = 0;
end = 0;
nexts = new HashMap<>();
}
}
private Node root;
public Trie() {
root = new Node();
}
public void insert(String word) {
if (word == null) {
return;
}
char[] chs = word.toCharArray();
Node node = root;
node.pass++;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
node.nexts.put(index, new Node());
}
node = node.nexts.get(index);
node.pass++;
}
node.end++;
}
public void erase(String word) {
if (countWordsEqualTo(word) != 0) {
char[] chs = word.toCharArray();
Node node = root;
node.pass--;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (--node.nexts.get(index).pass == 0) {
node.nexts.remove(index);
return;
}
node = node.nexts.get(index);
}
node.end--;
}
}
public int countWordsEqualTo(String word) {
if (word == null) {
return 0;
}
char[] chs = word.toCharArray();
Node node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
return 0;
}
node = node.nexts.get(index);
}
return node.end;
}
public int countWordsStartingWith(String pre) {
if (pre == null) {
return 0;
}
char[] chs = pre.toCharArray();
Node node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
return 0;
}
node = node.nexts.get(index);
}
return node.pass;
}
}
}

306
体系学习班/class08/Code02_TrieTree.java
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@ -1,306 +0,0 @@
package class08;
import java.util.HashMap;
// 该程序完全正确
public class Code02_TrieTree {
public static class Node1 {
public int pass;
public int end;
public Node1[] nexts;
// char tmp = 'b' (tmp - 'a')
public Node1() {
pass = 0;
end = 0;
// 0 a
// 1 b
// 2 c
// .. ..
// 25 z
// nexts[i] == null i方向的路不存在
// nexts[i] != null i方向的路存在
nexts = new Node1[26];
}
}
public static class Trie1 {
private Node1 root;
public Trie1() {
root = new Node1();
}
public void insert(String word) {
if (word == null) {
return;
}
char[] str = word.toCharArray();
Node1 node = root;
node.pass++;
int path = 0;
for (int i = 0; i < str.length; i++) { // 从左往右遍历字符
path = str[i] - 'a'; // 由字符，对应成走向哪条路
if (node.nexts[path] == null) {
node.nexts[path] = new Node1();
}
node = node.nexts[path];
node.pass++;
}
node.end++;
}
public void delete(String word) {
if (search(word) != 0) {
char[] chs = word.toCharArray();
Node1 node = root;
node.pass--;
int path = 0;
for (int i = 0; i < chs.length; i++) {
path = chs[i] - 'a';
if (--node.nexts[path].pass == 0) {
node.nexts[path] = null;
return;
}
node = node.nexts[path];
}
node.end--;
}
}
// word这个单词之前加入过几次
public int search(String word) {
if (word == null) {
return 0;
}
char[] chs = word.toCharArray();
Node1 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = chs[i] - 'a';
if (node.nexts[index] == null) {
return 0;
}
node = node.nexts[index];
}
return node.end;
}
// 所有加入的字符串中，有几个是以pre这个字符串作为前缀的
public int prefixNumber(String pre) {
if (pre == null) {
return 0;
}
char[] chs = pre.toCharArray();
Node1 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = chs[i] - 'a';
if (node.nexts[index] == null) {
return 0;
}
node = node.nexts[index];
}
return node.pass;
}
}
public static class Node2 {
public int pass;
public int end;
public HashMap<Integer, Node2> nexts;
public Node2() {
pass = 0;
end = 0;
nexts = new HashMap<>();
}
}
public static class Trie2 {
private Node2 root;
public Trie2() {
root = new Node2();
}
public void insert(String word) {
if (word == null) {
return;
}
char[] chs = word.toCharArray();
Node2 node = root;
node.pass++;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
node.nexts.put(index, new Node2());
}
node = node.nexts.get(index);
node.pass++;
}
node.end++;
}
public void delete(String word) {
if (search(word) != 0) {
char[] chs = word.toCharArray();
Node2 node = root;
node.pass--;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (--node.nexts.get(index).pass == 0) {
node.nexts.remove(index);
return;
}
node = node.nexts.get(index);
}
node.end--;
}
}
// word这个单词之前加入过几次
public int search(String word) {
if (word == null) {
return 0;
}
char[] chs = word.toCharArray();
Node2 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
return 0;
}
node = node.nexts.get(index);
}
return node.end;
}
// 所有加入的字符串中，有几个是以pre这个字符串作为前缀的
public int prefixNumber(String pre) {
if (pre == null) {
return 0;
}
char[] chs = pre.toCharArray();
Node2 node = root;
int index = 0;
for (int i = 0; i < chs.length; i++) {
index = (int) chs[i];
if (!node.nexts.containsKey(index)) {
return 0;
}
node = node.nexts.get(index);
}
return node.pass;
}
}
public static class Right {
private HashMap<String, Integer> box;
public Right() {
box = new HashMap<>();
}
public void insert(String word) {
if (!box.containsKey(word)) {
box.put(word, 1);
} else {
box.put(word, box.get(word) + 1);
}
}
public void delete(String word) {
if (box.containsKey(word)) {
if (box.get(word) == 1) {
box.remove(word);
} else {
box.put(word, box.get(word) - 1);
}
}
}
public int search(String word) {
if (!box.containsKey(word)) {
return 0;
} else {
return box.get(word);
}
}
public int prefixNumber(String pre) {
int count = 0;
for (String cur : box.keySet()) {
if (cur.startsWith(pre)) {
count += box.get(cur);
}
}
return count;
}
}
// for test
public static String generateRandomString(int strLen) {
char[] ans = new char[(int) (Math.random() * strLen) + 1];
for (int i = 0; i < ans.length; i++) {
int value = (int) (Math.random() * 6);
ans[i] = (char) (97 + value);
}
return String.valueOf(ans);
}
// for test
public static String[] generateRandomStringArray(int arrLen, int strLen) {
String[] ans = new String[(int) (Math.random() * arrLen) + 1];
for (int i = 0; i < ans.length; i++) {
ans[i] = generateRandomString(strLen);
}
return ans;
}
public static void main(String[] args) {
int arrLen = 100;
int strLen = 20;
int testTimes = 100000;
for (int i = 0; i < testTimes; i++) {
String[] arr = generateRandomStringArray(arrLen, strLen);
Trie1 trie1 = new Trie1();
Trie2 trie2 = new Trie2();
Right right = new Right();
for (int j = 0; j < arr.length; j++) {
double decide = Math.random();
if (decide < 0.25) {
trie1.insert(arr[j]);
trie2.insert(arr[j]);
right.insert(arr[j]);
} else if (decide < 0.5) {
trie1.delete(arr[j]);
trie2.delete(arr[j]);
right.delete(arr[j]);
} else if (decide < 0.75) {
int ans1 = trie1.search(arr[j]);
int ans2 = trie2.search(arr[j]);
int ans3 = right.search(arr[j]);
if (ans1 != ans2 || ans2 != ans3) {
System.out.println("Oops!");
}
} else {
int ans1 = trie1.prefixNumber(arr[j]);
int ans2 = trie2.prefixNumber(arr[j]);
int ans3 = right.prefixNumber(arr[j]);
if (ans1 != ans2 || ans2 != ans3) {
System.out.println("Oops!");
}
}
}
}
System.out.println("finish!");
}
}
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