跳跃表实现文件C语言

祝自己,情人节快乐.

  今天是正月十五.在家研究了一天收费公路重建问题.可耻的是,居然目前还没有搞正确.

  倒是发现,原来的跳跃表有问题.

  还好,这个问题正确地解决了. 

/* SkipList.c -- 跳跃表实现文件 */ #include "SkipList.h" /* 局部函数声明 */ static int logTwo (const int value) ; static void endow (Item * const l_value, const Item * const r_value) ; static BOOL isEqualTo (const Item * const pil, const Item * const pir) ; static BOOL isLesserThan (const Item * const pil, const Item * const pir) ; static Node * makeNode (const Item * const pi, const int maximum_of_height) ; /* 接口函数定义 */ void InitializSeed_S (const long int initial_value) { #ifdef DEBUG assert (initial_value > 0) ; #endif Seed = initial_value ; } BOOL Random_S (void) { long int temp_seed ; double temp_value ; int return_value ; #ifdef DEBUG assert (Seed > 0) ; #endif temp_seed = A * (Seed % Q) - R * (Seed / Q) ; if (temp_seed >= 0) Seed = temp_seed ; else Seed = temp_seed + M ; temp_value = (double) Seed / M ; while (temp_value < 1) temp_value *= 100 ; return_value = (int) temp_value & MASK ; if (1 == return_value) return TRUE ; else return FALSE ; } BOOL Initialize_S (SkipList * const psl, const int capacity) { Item undecided = UNDECIDED ; int i, height ; #ifdef DEBUG assert (capacity > 0) ; #endif *psl = (struct skiplist *) malloc (sizeof (struct skiplist)) ; if (NULL == psl) return FALSE ; (*psl) -> capacity = capacity ; (*psl) -> current = 0 ; (*psl) -> maximum_of_height = height = logTwo (capacity) ; (*psl) -> head = (Node *) malloc (sizeof (Node)) ; if (NULL == (*psl) -> head) { free (*psl) ; return FALSE ; } (*psl) -> head -> next = (Node * *) malloc (sizeof (Node *) * height) ; if (NULL == (*psl) -> head -> next) { free ((*psl) -> head) ; free (*psl) ; return FALSE ; } endow (&(*psl) -> head -> item, &undecided) ; (*psl) -> head -> height = height ; (*psl) -> head -> times = 1 ; for (i = 0; i < height; i++) (*psl) -> head -> next[i] = NULL ; return TRUE ; } BOOL IsEmpty_S (const SkipList * const psl) { if (0 == (*psl) -> current) return TRUE ; else return FALSE ; } BOOL IsFull_S (const SkipList * const psl) { if ((*psl) -> capacity == (*psl) -> current) return TRUE ; else return FALSE ; } BOOL Find_S (const SkipList * const psl, const Item * const pi) { Node * scan ; int height ; if (IsEmpty_S (psl)) return FALSE ; scan = (*psl) -> head ; height = scan -> height ; while (height > 0) { if (NULL == scan -> next[height - 1] || TRUE == isLesserThan (pi, &scan -> next[height - 1] -> item)) height-- ; else if (TRUE == isEqualTo (pi, &scan -> next[height - 1] -> item)) return TRUE ; else/* if (FALSE = isLessetThan (pi, &scan -> next[height - 1] -> item)) */ { scan = scan -> next[height - 1] ; height = scan -> height ; } } return FALSE ; } Item * FindMax_S (const SkipList * const psl) { Node * scan ; int height ; if (IsEmpty_S (psl)) return NULL ; height = (*psl) -> maximum_of_height ; scan = (*psl) -> head ; while (height > 1) { if (NULL == scan -> next[height - 1]) height-- ; else { scan = scan -> next[height - 1] ; height = scan -> height ; } } while (scan -> next[0] != NULL) scan = scan -> next[0] ; return &scan -> item ; } BOOL Insert_S (const SkipList * const psl, const Item * const pi) { Node * new_node ; Node * scan ; int height, new_height, i ; if (IsFull_S (psl)) return FALSE ; new_node = makeNode (pi, (*psl) -> maximum_of_height) ; if (NULL == new_node) return FALSE ; if (IsEmpty_S (psl)) { new_height = new_node -> height ; for (i = 0 ; i < new_height; i++) (*psl) -> head -> next[i] = new_node ; } else { scan = (*psl) -> head ; height = (*psl) -> maximum_of_height ; new_height = new_node -> height ; while (height > 0) { if (NULL == scan -> next[height - 1] || TRUE == isLesserThan (pi, &scan -> next[height - 1] -> item) || TRUE == isEqualTo (pi, &scan -> next[height - 1] -> item)) { if (height <= new_height) { new_node -> next[--new_height] = scan -> next[height - 1] ; scan -> next[height - 1] = new_node ; } height-- ; } else/* if (FALSE == isLesserThan (&pi -> item, &scan -> next[height - 1] -> item)) */ { scan = scan -> next[height - 1] ; height = scan -> height ; } } } (*psl) -> current++ ; return TRUE ; } BOOL Delete_S (const SkipList * const psl, const Item * const pi) { Node * scan, * temp ; int height ; BOOL index = FALSE ; if (IsEmpty_S (psl)) return FALSE ; scan = (*psl) -> head ; height = (*psl) -> maximum_of_height ; while (height > 0) { if (NULL == scan -> next[height -1] || TRUE == isLesserThan (pi, &scan -> next[height - 1] -> item)) height-- ; else if (TRUE == isEqualTo (pi, &scan -> next[height - 1] -> item)) { if (1 == height) { temp = scan -> next[height - 1] ; index = TRUE ; } scan -> next[height - 1] = scan -> next[height - 1] -> next[height - 1] ; height-- ; } else/* if FALSE == isLeaaseThan (pi, &scan -> next[height - 1] -> item)) */ { scan = scan -> next[height - 1] ; height = scan -> height ; } } if (TRUE == index) { (*psl) -> current-- ; free (temp) ; return TRUE ; } else return FALSE ; } void Traversal_S (const SkipList * const psl, void (* pfun) (const Node * const pn)) { Node * scan ; scan = (*psl) -> head ; while (scan) { (* pfun) (scan) ; scan = scan -> next[0] ; } } void Release_S (const SkipList * const psl) { Node * scan, * temp ; scan = (*psl) -> head -> next[0] ; while (scan) { temp = scan ; scan = scan -> next[0] ; free (temp -> next) ; free (temp) ; } free ((*psl) -> head -> next) ; free ((*psl) -> head) ; free (*psl) ; } /* 局部函数定义 */ static int logTwo (const int value) { int power = 2, i = 1 ; while (1) { if (value == (power *= 2)) { i++ ; break ; } else if (power < value) i++ ; else { i++ ; break ; } } return i ; } static void endow (Item * const l_value, const Item * const r_value) { *l_value = *r_value ; } static BOOL isEqualTo (const Item * const pil, const Item * const pir) { if (*pil == *pir) return TRUE ; else return FALSE ; } static BOOL isLesserThan (const Item * const pil, const Item * const pir) { if (*pil < *pir) return TRUE ; else return FALSE ; } static Node * makeNode (const Item * const pi, const int maximum_of_height) { Node * new_node ; int i = 0, j ; new_node = (Node *) malloc (sizeof (Node)) ; if (NULL == new_node) return NULL ; endow (&new_node -> item, pi) ; new_node -> times = 1 ; do i++ ; while (i < maximum_of_height && TRUE == Random_S ()) ; new_node -> next = (Node * *) malloc (sizeof (Node *) * i) ; if (NULL == new_node -> next) { free (new_node) ; return NULL ; } new_node -> height = i ; new_node -> times = 1 ; for (j = 0; j < i; j++) new_node -> next[j] = NULL ; return new_node ; }