Merge pull request #311 from liuzhang/master

二叉搜索树和字典树 C版本

c-cpp/24_tree/Trie.c

@@ -0,0 +1,91 @@
+/*************************************************************************
+ > Author:  Liu Zhang
+ > Mail:    lz-850610@163.com
+ > Time:    2019-05-10
+ > Desc:    字典树实现
+ ************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define OK 1
+#define ERROR 0
+#define TRUE 1
+#define FALSE 0
+
+typedef int Status;
+
+typedef struct Node {
+    char data;
+    struct Node *children[26];
+    Status end;
+} Trie, *TriePtr;
+
+void Init(TriePtr *T)
+{
+    (*T) = (TriePtr)malloc(sizeof(Trie));
+    (*T)->data = '/';
+    (*T)->end = FALSE;
+}
+
+void Insert(TriePtr T, char *str) {
+
+    int index;
+    char c;
+
+    while(c = *str++)
+    {
+        index = c - 'a';
+        if (T->children[index] == NULL)
+        {
+            TriePtr Node;
+            Node = (TriePtr)malloc(sizeof(Trie));
+            Node->data = c;
+            Node->end = FALSE;
+            T->children[index] = Node;
+        }
+
+        T = T->children[index];
+    }
+
+    T->end = TRUE;
+}
+
+
+Status Search(TriePtr T, char *str) {
+
+    int index;
+    char c;
+
+    while(c = *str++)
+    {
+        index = c - 'a';
+        if (T->children[index] == NULL)
+        {
+            return FALSE;
+        }
+
+        T = T->children[index];
+    }
+
+    if (T->end) {
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+
+int main(int argc, char const *argv[])
+{
+    TriePtr T;
+    Init(&T);
+    char *str = "hello";
+    char *str2 = "hi";
+
+    Insert(T, str);
+
+    printf("str is search %d\n", Search(T, str));
+    printf("str2 is search %d\n", Search(T, str2));
+    return 0;
+}

c-cpp/24_tree/binarysearchtree.c

@@ -0,0 +1,214 @@
+/*************************************************************************
+ > Author:  Liu Zhang
+ > Mail:    lz-850610@163.com
+ > Time:    2019-05-10
+ > Desc:    二叉搜索树实现
+ ************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define OK 1
+#define ERROR 0
+#define TRUE 1
+#define FALSE 0
+typedef int Status;
+typedef char ElemType;
+
+typedef struct node {
+    ElemType data;
+    struct node *lchild, *rchild;
+} BTree, *BTreePtr;
+
+/**************** 插入 **********************/
+Status Insert(BTreePtr *T, ElemType e) {
+
+    BTreePtr p;
+
+    if (*T == NULL) {
+        *T = (BTreePtr)malloc(sizeof(BTree));
+        (*T)->data = e;
+
+        return TRUE;
+    } else {
+        p = *T;
+        while ( p != NULL) {
+
+            if (e > p->data) {
+
+                if (p->rchild == NULL) {
+                    p->rchild = (BTreePtr) malloc (sizeof(BTree));
+                    p->rchild->data = e;
+                    return TRUE;
+                }
+                p = p->rchild;
+            } else {
+
+                if (p->lchild == NULL)
+                {
+                    p->lchild = (BTreePtr) malloc (sizeof(BTree));
+                    p->lchild->data = e;
+                    return TRUE;
+                }
+                p = p->lchild;
+            }
+        }
+    }
+
+    return FALSE;
+}
+
+/**************** 删除 **********************/
+Status Delete(BTreePtr T, ElemType e) {
+    BTreePtr p, pp, minP, minPP, child;
+    child = NULL;
+    p = T;
+    pp = NULL;
+
+    while ( (p != NULL) && (p->data != e) ) {
+        pp = p;
+
+        if (e > p->data) {
+            p = p->rchild;
+        } else {
+            p = p->lchild;
+        }
+    }
+
+    if (p == NULL) return FALSE;
+
+    //双节点
+    if ((p->lchild != NULL) && (p->rchild != NULL))
+    {
+        minPP = p;
+        minP = p->rchild;
+
+        while (minP->lchild != NULL) {
+            minPP = minP;
+            minP = minP->lchild;
+        }
+        p->data = minP->data;
+        free(minP);
+        minPP->lchild = NULL;
+
+        return TRUE;
+    }
+
+    //有一个节点
+    if ((p->lchild != NULL) || (p->rchild != NULL)) {
+
+        if (p->lchild) {
+            child = p->lchild;
+        } else {
+           child = p->rchild;
+        }
+        free(p);
+    }
+
+    //没有节点
+    if (pp->lchild == p) {
+        pp->lchild = child;
+    } else {
+        pp->rchild = child;
+    }
+
+    return TRUE;
+}
+
+/**************** 查找 **********************/
+
+Status Find(BTreePtr T, ElemType e) {
+
+    if (T == NULL) return FALSE;
+
+    while ((T != NULL) && (T->data != e)) {
+
+        if (e > T->data) {
+            T = T->rchild;
+        } else {
+            T = T->lchild;
+        }
+    }
+
+    if (T) {
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+
+/**************** 最大值 **********************/
+ElemType FindMax(BTreePtr T) {
+    ElemType max;
+
+    while(T != NULL) {
+        max = T->data;
+        T = T->rchild;
+    }
+    return max;
+}
+
+
+/**************** 最小值 **********************/
+ElemType FindMin(BTreePtr T) {
+    ElemType min;
+
+    while(T != NULL) {
+        min = T->data;
+        T = T->lchild;
+    }
+    return min;
+}
+
+
+void PreOrderTraverse(BTreePtr T)//前序遍历二叉树
+{
+    if (T == NULL) return;
+
+    if(T)
+    {
+        printf("%d ",T->data);
+        PreOrderTraverse(T->lchild);
+        PreOrderTraverse(T->rchild);
+    }
+}
+
+
+void DestroyTree(BTreePtr T) {
+    if (T)
+    {
+        if (T->lchild)
+        {
+            DestroyTree(T->lchild);
+        }
+
+        if(T->rchild)
+        {
+            DestroyTree(T->rchild);
+        }
+
+        free(T);
+        T = NULL;
+    }
+}
+
+/***************** 执行测试 *************************/
+int main(int argc, char const *argv[])
+{
+    BTreePtr T;
+    T = NULL;
+    int a[] = {33, 16, 50, 13, 18, 34, 58, 15, 17, 25, 51, 66, 19, 27, 55};
+    int i;
+    for (i = 0; i < 15; i++) {
+        Insert(&T, a[i]);
+    }
+    printf("Max is %d\n", FindMax(T));
+    printf("Min is %d\n", FindMin(T));
+    Delete(T, 18);
+    Delete(T, 13);
+    PreOrderTraverse(T);
+    DestroyTree(T);
+
+    return 0;
+}