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发表于 2021-11-20 23:13:59
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 main.c
- #include "list.h"
- #include <stdio.h>
- #include <stdbool.h>
- typedef struct {
- int number;
- size_t count;
- } pair_t;
- void store(list_t *list, int value) {
- pair_t pair;
- for(size_t i = 0; i < list_size(list); ++i) {
- list_get(list, i, &pair, sizeof(pair));
- if(pair.number == value) {
- ++pair.count;
- list_set(list, i, &pair, sizeof(pair));
- return;
- }
- }
- pair.number = value;
- pair.count = 1;
- list_append(list, &pair, sizeof(pair));
- }
- int main(void) {
- list_t *list = list_init();
- while(1) {
- int temp; scanf("%d", &temp);
- store(list, temp);
- int ch = getchar();
- if(ch != ',') break;
- }
- pair_t pair;
- list_t *min = list_init();
- size_t count = 1;
- while(1) {
- bool flag = false;
- for(size_t i = 0; i < list_size(list); ++i) {
- list_get(list, i, &pair, sizeof(pair));
- if(pair.count == count) {
- flag = true;
- list_append(min, &pair, sizeof(pair));
- }
- }
- ++count;
- if(flag) break;
- }
- for(size_t i = 0; i < list_size(min); ++i) {
- list_get(min, i, &pair, sizeof(pair));
- printf("%d: %lu\n", pair.number, pair.count);
- }
- list_deinit(min);
- list_deinit(list);
- return 0;
- }
复制代码
list.h
- #ifndef _LIST_H_
- #define _LIST_H_
- #include <stddef.h>
- #include <stdbool.h>
- struct list_node_tag {
- void *data; size_t size;
- struct list_node_tag *next;
- };
- typedef struct {
- struct list_node_tag *head;
- size_t size;
- } list_t;
- list_t *list_init(void);
- void list_deinit(list_t *list);
- bool list_clean(list_t *list);
- bool list_insert(list_t *list, size_t index, const void *data, size_t size);
- bool list_delete(list_t *list, size_t index);
- bool list_get(const list_t *list, size_t index, void *data, size_t size);
- bool list_set(list_t *list, size_t index, const void *data, size_t size);
- bool list_append(list_t *list, const void *data, size_t size);
- size_t list_size(const list_t *list);
- bool list_empty(const list_t *list);
- #endif
复制代码
list.c
- #include "list.h"
- #include <stdlib.h>
- #include <memory.h>
- list_t *list_init(void) {
- list_t *list = malloc(sizeof(*list));
- if(!list) return NULL;
- list->head = NULL;
- list->size = 0;
- return list;
- }
- void list_deinit(list_t *list) {
- if(!list) return;
- list_clean(list);
- free(list);
- }
- bool list_clean(list_t *list) {
- if(!list) return false;
- while(!list_empty(list)) list_delete(list, 0);
- return true;
- }
- bool list_insert(list_t *list, size_t index, const void *data, size_t size) {
- if(!list) return false;
- if(list_size(list) < index) return false;
- if(!data) return false;
- struct list_node_tag **current = &list->head;
- while(index--) current = &(*current)->next;
- struct list_node_tag *node = malloc(sizeof(*node));
- if(!node) return false;
- node->data = malloc(size);
- if(!node->data) {free(node); return false;}
- memcpy(node->data, data, size);
- node->size = size;
- node->next = *current;
- *current = node;
- ++list->size;
- return true;
- }
- bool list_delete(list_t *list, size_t index) {
- if(!list) return false;
- if(list_size(list) <= index) return false;
- struct list_node_tag **current = &list->head;
- while(index--) current = &(*current)->next;
- struct list_node_tag *temp = *current;
- *current = temp->next;
- free(temp->data); free(temp);
- --list->size;
- return true;
- }
- bool list_get(const list_t *list, size_t index, void *data, size_t size) {
- if(!list) return false;
- if(list_size(list) <= index) return false;
- if(!data) return false;
- struct list_node_tag *const *current = &list->head;
- while(index--) current = &(*current)->next;
- struct list_node_tag *temp = *current;
- if(temp->size > size) return false;
- memcpy(data, temp->data, temp->size);
- return true;
- }
- bool list_set(list_t *list, size_t index, const void *data, size_t size) {
- bool res = list_delete(list, index);
- return res ? list_insert(list, index, data, size) : res;
- }
- bool list_append(list_t *list, const void *data, size_t size) {
- if(!list) return false;
- return list_insert(list, list_size(list), data, size);
- }
- size_t list_size(const list_t *list) {
- if(!list) return 0;
- return list->size;
- }
- bool list_empty(const list_t *list) {
- if(!list) return true;
- return list_size(list) == 0;
- }
复制代码
- $ gcc-debug -o main main.c list.c
- $ ./main
- 4, 1, 2, 1, 2
- 4: 1
- $ ./main
- 12, 12, 34, 56, 56
- 34: 1
- $ ./main
- 1234, 1234, 7654, 234, 234, 987
- 7654: 1
- 987: 1
- $ ./main
- 12, 12, 1234, 1234, 1234, 98, 98, 98, 98, 98
- 12: 2
- $
复制代码 |
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