通过数组实现线性表
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2022-03-22 15:20:16
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基本实现:
一、头文件、宏定义以及函数声明:
#include <stdio.h> #include <stdlib.h> #define LIST_INIT_SIZE 100 #define LIST_INC 10 typedef int ElemType; typedef enum Status { success, range_error, fatal, fail } Status; typedef struct sqlList { ElemType *elem; // 结点元素 int length; // List的当前长度 int list_size; // List的最大长度 } SqList, *Ptr; typedef Ptr SqlListptr; Status List_Init(SqlListptr L); Status List_Retrival(SqlListptr L, int pos, ElemType *elem); Status List_Locate(SqlListptr L, int *pos, ElemType elem); Status List_Insert(SqlListptr L, int pos, ElemType elem); Status List_delete(SqlListptr L, int pos);
二、初始化函数:
Status List_Init(SqlListptr L) { Status s = success; L->list_size = LIST_INIT_SIZE; L->length = 0; L->elem = (ElemType*)malloc(sizeof(ElemType)*L->list_size); // malloc() 返回的是空指针,所以需要强制转换 if(L->elem == NULL) { s = fatal; } return s; }
三、功能函数:
// 按位置查找元素 Status List_Retrival(SqlListptr L, int pos, ElemType *elem) { Status s = range_error; if(L) { if((pos-1>=0) && (pos-1) < L->length) { *elem = L->elem[pos-1]; s = success; } } else s = fatal; return s; } // 按值查找元素 Status List_Locate(SqlListptr L, int *pos, ElemType elem) { Status s = range_error; if(L) { for(size_t i = 0; i < L->length; i++) { if(elem == L->elem[i]) { *pos = i+1; s = success; break; } } } else s = fatal; return s; } // 插入元素 Status List_Insert(SqlListptr L, int pos, ElemType elem) { Status s = range_error; if((pos-1) >= 0 && (pos-1) <= L->length) { if(L && L->length < L->list_size ) { for(int i = L->length-1; i >= pos-1 ; i--) { L->elem[i+1] = L->elem[i]; } L->elem[pos-1] = elem; L->length++; s = success; } } else s = fatal; return s; } // 删除元素 Status List_delete(SqlListptr L, int pos) { Status s = range_error; if((pos-1) >= 0 && (pos-1) < L->length) { if(L && L->length > 0) { for(int i = pos; i <= L->length; i++) { L->elem[i-1] = L->elem[i]; } L->length--; s = success; } } else { s = fail; } return s; }
完整实现代码:
#include <stdio.h> #include <stdlib.h> #define LIST_INIT_SIZE 100 #define LIST_INC 10 typedef int ElemType; typedef enum Status { success, range_error, fatal, fail } Status; typedef struct sqlList { ElemType *elem; // 结点元素 int length; // List的当前长度 int list_size; // List的最大长度 } SqList, *Ptr; typedef Ptr SqlListptr; Status List_Init(SqlListptr *L); Status List_Retrival(SqlListptr L, int pos, ElemType *elem); Status List_Locate(SqlListptr L, int *pos, ElemType elem); Status List_Insert(SqlListptr L, int pos, ElemType elem); Status List_delete(SqlListptr L, int pos); void List_print(SqlListptr L); int dealProcess(void); int main(int argc, char const *argv[]) { dealProcess(); return 0; } // 处理过程 int dealProcess() { int action; Status s; SqlListptr L = (SqlListptr)malloc(sizeof(SqList));; int position, *elem; int *pos, value; printf("初始化线性表——1\n"); printf("按位置查找元素——2\n"); printf("按值查找元素——3\n"); printf("插入元素——4\n"); printf("删除元素——5\n"); printf("打印元素——6\n"); printf("输入当前操作:\n"); while((scanf("%d", &action)) != EOF){ switch (action) { case 1: s = List_Init(&L); if(s == success) { printf("初始化成功\n"); } else { printf("初始化错误\n"); } break; case 2: printf("请输入查询位置:\n"); scanf("%d", &position); elem = malloc(sizeof(int)); s = List_Retrival(L, position, elem); if(s == success) { printf("你所查询的元素是:%d\n", *elem); } else { printf("该位置无元素\n"); } break; case 3: pos = malloc(sizeof(int)); printf("请输入要查询元素的值:\n"); scanf("%d", &value); s = List_Locate(L, pos, value); if(s == success) { printf("%d 的位置在 %d\n", value, *pos); } else { printf("未找到该元素\n"); } free(pos); break; case 4: printf("请依次输入插入位置和插入的值\n"); scanf("%d %d", &position, &value); s = List_Insert(L, position, value); if(s == success) { printf("插入成功\n"); } else { printf("插入失败\n"); } break; case 5: printf("请输入要删除的元素的位置\n"); scanf("%d", &position); s = List_delete(L, position); if(s == success) { printf("删除成功\n"); } else { printf("删除失败\n"); } break; case 6: printf("*****************************\n"); List_print(L); printf("*****************************\n"); break; } } return 0; } // 初始化线性表 Status List_Init(SqlListptr *L) { Status s = fail; (*L)->length = 0; (*L)->list_size = LIST_INIT_SIZE; (*L)->elem = malloc(sizeof(int)*LIST_INIT_SIZE); s = success; return s; } // 按位置查找元素 Status List_Retrival(SqlListptr L, int pos, ElemType *elem) { Status s = range_error; if(L) { if((pos-1>=0) && (pos-1) < L->length) { *elem = L->elem[pos-1]; s = success; } } else s = fatal; return s; } // 按值查找元素 Status List_Locate(SqlListptr L, int *pos, ElemType elem) { Status s = range_error; if(L) { for(int i = 0; i < L->length; i++) { if(elem == L->elem[i]) { *pos = i+1; s = success; break; } } } else s = fatal; return s; } // 插入元素 Status List_Insert(SqlListptr L, int pos, ElemType elem) { Status s = range_error; if((pos-1) >= 0 && (pos-1) <= L->length) { if(L && L->length < L->list_size ) { for(int i = L->length-1; i >= pos-1 ; i--) { L->elem[i+1] = L->elem[i]; } L->elem[pos-1] = elem; L->length++; s = success; } } else s = fatal; return s; } // 删除元素 Status List_delete(SqlListptr L, int pos) { Status s = range_error; if((pos-1) >= 0 && (pos-1) < L->length) { if(L && L->length > 0) { for(int i = pos; i <= L->length; i++) { L->elem[i-1] = L->elem[i]; } L->length--; s = success; } } else { s = fail; } return s; } // 打印元素 void List_print(SqlListptr L) { int flag = 0; if(L->length == 0) printf("无元素\n"); else { for(int i = 0; i < L->length; i++) { if(flag) printf(" "); flag = 1; printf("%d", *(L->elem++)); } printf("\n"); } }
总体来说数组线性表实现比较简单,查询元素速度较快,但是插入和删除元素效率很低:
插入元素时间复杂度:
删除元素时间复杂度:
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