Merge pull request #2 from wangzheng0822/master

merge to my fork

Author: chinalwb

.gitignore

@@ -21,3 +21,6 @@
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
+
+# editor files
+.vscode

c-cpp/.gitignore

@@ -0,0 +1,9 @@
+# main files
+main.*
+
+# executives
+a.out
+
+# objective files
+*.o
+*.obj

c-cpp/06_linkedlist/palindromeList/LinkedList.hpp

@@ -0,0 +1,118 @@
+/**
+ * Author:  TripleZ<[email protected]>
+ * Date:    2018-10-10
+ * Brief:   Linked list class.
+ */
+
+#ifndef _LINKEDLIST_HPP_
+#define _LINKEDLIST_HPP_
+
+#include <cstdio>
+#include "ListNode.hpp"
+
+class LinkedList {
+public:
+    int size;
+    int length;
+    ListNode *head;
+    LinkedList();
+    LinkedList(int size);
+    ~LinkedList();
+    ListNode* FindElem(int elemVal);
+    bool DeleteElem(ListNode *elem);
+    bool DeleteLastElem();
+    bool InsertElemAtFront(int elemVal);
+    bool InsertElemAtBack(int elemVal);
+    void PrintList();
+};
+
+LinkedList::LinkedList() {
+    this -> head = new ListNode();
+    this -> head->next = nullptr;
+    this -> head->val = -1;
+    this -> size = 10; // default
+    this -> length = 0;
+}
+
+LinkedList::LinkedList(int size) {
+    this -> head = new ListNode();
+    this -> head->next = nullptr;
+    this -> head->val = -1;
+    
+    this -> size = size;
+    this -> length = 0;
+}
+
+LinkedList::~LinkedList() {
+    ListNode *p, *q;
+    p = this -> head;
+    while(p -> next != nullptr) {
+        q = p -> next;
+        p -> next = p -> next -> next;
+        delete q;
+    }
+    delete head;
+    this -> head = nullptr;
+    this -> length = 0;
+}
+
+ListNode* LinkedList::FindElem(int elemVal) {
+    ListNode *p;
+    for (p = this -> head; p != nullptr; p = p -> next) {
+        if (p -> val == elemVal) {
+            return p;
+        }
+    }
+    return nullptr;
+}
+
+bool LinkedList::DeleteElem(ListNode *elem) {
+    ListNode *prev, *next;
+    for (prev = this -> head; prev -> next != elem; prev = prev -> next);
+    next = elem -> next;
+    prev -> next = next;
+    delete elem;
+    this -> length --;
+    return true;
+}
+
+bool LinkedList::DeleteLastElem() {
+    ListNode *prev, *elem;
+    for (prev = this -> head; prev -> next -> next != nullptr; prev = prev -> next) ;
+    elem = prev -> next;
+    prev -> next = nullptr;
+    delete elem;
+    this -> length --;
+    return true;
+}
+
+bool LinkedList::InsertElemAtFront(int elemVal) {
+    ListNode *newNode = new ListNode();
+    newNode -> val = elemVal;
+    newNode -> next = this -> head -> next;
+    this -> head -> next = newNode;
+    this -> length ++;
+    return true;
+}
+
+bool LinkedList::InsertElemAtBack(int elemVal) {
+    ListNode *newNode = new ListNode();
+    newNode -> val = elemVal;
+    ListNode *end;
+    for (end = this -> head; end -> next != nullptr; end = end -> next);
+    end -> next = newNode;
+    newNode -> next = nullptr;
+    this -> length ++;
+    return true;
+}
+
+void LinkedList::PrintList() {
+    ListNode *elem;
+    printf("List: ");
+    for (elem = this -> head -> next; elem -> next != nullptr; elem = elem -> next) {
+        printf("%d - ", elem -> val);
+    }
+    printf("%d\n", elem -> val);
+}
+
+#endif

c-cpp/06_linkedlist/palindromeList/ListNode.hpp

@@ -0,0 +1,16 @@
+/**
+ * Author:  TripleZ<[email protected]>
+ * Date:    2018-10-10
+ * Brief:   ListNode class.
+ */
+
+#ifndef _LISTNODE_HPP_
+#define _LISTNODE_HPP_
+
+class ListNode {
+public:
+    int val;
+    ListNode *next;
+};
+
+#endif

c-cpp/06_linkedlist/palindromeList/palindromeList.cpp

@@ -0,0 +1,92 @@
+/**
+ * Author:  TripleZ<[email protected]>
+ * Date:    2018-10-10
+ * Brief:   Check a list whether is palindrome.
+ */
+
+#include <cstdio>
+#include "LinkedList.hpp"
+
+bool CheckPalindromeList(LinkedList *list) {
+    // 使用快慢指针找链表中点
+    ListNode *slow, *fast, *mid2;
+    slow = list -> head;
+    fast = list -> head;
+    while (fast -> next != nullptr) {
+        slow = slow -> next;
+        fast = fast -> next;
+        if (fast -> next != nullptr) {
+            fast = fast -> next;
+            mid2 = slow -> next;
+        } else {
+            mid2 = nullptr;
+        }
+    }
+
+    // 从中点向后逆转链表（区分奇偶情况）
+    ListNode *mid = slow;
+    ListNode *elem, *prev, *save;
+    if (mid2 == nullptr) {  // odd
+        elem = mid;
+        prev = mid -> next;
+    } else {  // even
+        elem = mid2;
+        prev = mid2 -> next;
+        mid2 -> next = nullptr;
+    }
+    save = prev -> next;
+    mid -> next = nullptr;
+    while (save != nullptr) {
+        prev -> next = elem;
+        elem = prev;
+        prev = save;
+        save = save -> next;
+    }
+    prev -> next = elem;
+
+    ListNode *end = prev;
+    ListNode *front = list -> head -> next;
+
+    // 从头尾同时遍历比较，检测链表是否为回文
+    bool palindrome = true;
+    while (front != end) {
+        // printf("%d, %d\n", front -> val, end -> val);
+        if (front -> val != end -> val) {
+            palindrome = false;
+            break;
+        }
+        front = front -> next;
+        end = end -> next;
+    }
+
+    palindrome ? printf("The list is palindrome~\n") : printf("The list is not palindrome!\n");
+
+    return palindrome;
+}
+
+int main(int argc, char const *argv[]) {
+    
+    int init[] = {1, 2, 3, 2, 1};
+    LinkedList *list = new LinkedList(5);
+    for (int i = 0; i < 5; i++) {
+        list -> InsertElemAtBack(init[i]);
+    }
+    list -> PrintList();
+
+    CheckPalindromeList(list);  // true
+    
+    list -> InsertElemAtFront(5);
+    CheckPalindromeList(list);  // false
+
+
+    int init2[] = {1, 2, 3, 3, 2, 1};
+    LinkedList *list2 = new LinkedList(10);
+    for (int i = 0; i < 6; i++) list2 -> InsertElemAtBack(init2[i]);
+    list2 -> PrintList();
+    CheckPalindromeList(list2);
+
+    list2 -> InsertElemAtBack(4);
+    CheckPalindromeList(list2);
+
+    return 0;
+}

c-cpp/07_linkedlist/linked_list.h

@@ -0,0 +1,22 @@
+/**
+ * 单链表
+ *
+ * Author: Liam Huang (Liam0205)
+ */
+
+#ifndef LINKEDLIST_LINKED_LIST_H_
+#define LINKEDLIST_LINKED_LIST_H_
+
+#include <memory>
+
+template <typename T>
+struct Node {
+    using ptr_t = std::shared_ptr<Node<T>>;
+    T     data;
+    ptr_t next;
+
+    Node(T data_) : data(data_), next(nullptr) {}
+    Node() : next(nullptr) {}
+};
+
+#endif  // LINKEDLIST_LINKED_LIST_H_