struct DocNode *temp_result#include =<stdio.h>
#include doc_lists[0];<stdlib.h>
// 定义DocNode结构
struct DocNode {
struct DocNode *temp2_result =int doc_lists[0];doc_id;
//doc_list[0]=338216struct 338217DocNode* 379830next;
};
//输出这个doc_list[0]
创建新的节点
struct forDocNode* create_node(int i = 0; i < query_count; i++doc_id) {
struct DocNode* new_node = printf("doc[%d]struct is:",iDocNode*)malloc(sizeof(struct DocNode));
new_node->doc_id = doc_id;
struct DocNode *doc_listnew_node->next = doc_lists[i];NULL;
return new_node;
}
int whilemain(doc_list){
// 定义doc_lists数组,假设有两个链表
int query_count = 2;
struct DocNode *tempstruct =DocNode* doc_list;doc_lists[2];
// 初始化第一个链表: 338216 -> 338217 -> 379830
printf("%d ",temp->doc_id doc_lists[0] = create_node(338216);
doc_lists[0]->next = create_node(338217);
doc_lists[0]->next->next = doc_list=doc_list->next;create_node(379830);
// 初始化第二个链表: 123456 -> }789012
doc_lists[1] = create_node(123456);
doc_lists[1]->next = printfcreate_node("\n"789012);
}
// 输出每个链表的内容
for(int i=1;i<query_count;i++i = 0; i < query_count; i++){
printf("I is %d and temp_result"doc[%d] is:",i-1);
struct DocNode* doc_list = //输出并释放temp_resultdoc_lists[i];
while(temp_resultdoc_list){
structprintf("%d DocNode", *tempdoc_list->doc_id);
= temp_result;
doc_list = temp_result=temp_resultdoc_list->next;
}
printf("%d ",temp->doc_id"\n");
}
// 遍历并释放链表1中的节点
free struct DocNode* temp_result = doc_lists[0];
printf(temp"\nReleasing temp_result:\n");
while (temp_result) {
struct DocNode* temp = temp=NULL;temp_result;
}temp_result = temp_result->next;
printf("\n""%d ", temp->doc_id);
free(temp);
}
printf("\n");
//再次输出doc_list[0] 再次尝试输出链表内容
printf("\nTo check the result\n"result:\n");
for (int i = 0; i < query_count; i++) {
printf("doc[%d] is:",i);
struct DocNodeDocNode* *doc_listdoc_list = doc_lists[i];
while(doc_list){
struct DocNode *temp = doc_list;{
printf("%d ",temp doc_list->doc_id);
doc_list=doc_list->next;
doc_list = //free(temp)doc_list->next;
}
printf("\n");
}
return 0;
}
I am a computer beginner, this is the first time to ask, please forgive me, and sincerely thank you
The last question did not pass, I changed it again (now I put in the modified minimum running code), now the problem is, I want to use a *temp_list=doc_list[0], but my subsequent operation will delete some of the content of temp_list[0], This causes parts of the doc_list[0] to seem to have been modified for some reason. What can I do about this?
struct DocNode *temp_result = doc_lists[0];
struct DocNode *temp2_result = doc_lists[0];
//doc_list[0]=338216 338217 379830
//输出这个doc_list[0]
for (int i = 0; i < query_count; i++) {
printf("doc[%d] is:",i);
struct DocNode *doc_list = doc_lists[i];
while(doc_list){
struct DocNode *temp = doc_list;
printf("%d ",temp->doc_id);
doc_list=doc_list->next;
}
printf("\n");
}
for(int i=1;i<query_count;i++){
printf("I is %d and temp_result is:",i-1);
//输出并释放temp_result
while(temp_result){
struct DocNode *temp = temp_result;
temp_result=temp_result->next;
printf("%d ",temp->doc_id);
free(temp);
temp=NULL;
}
printf("\n");
}
//再次输出doc_list[0]
printf("\nTo check the result\n");
for (int i = 0; i < query_count; i++) {
printf("doc[%d] is:",i);
struct DocNode *doc_list = doc_lists[i];
while(doc_list){
struct DocNode *temp = doc_list;
printf("%d ",temp->doc_id);
doc_list=doc_list->next;
//free(temp)
}
printf("\n");
}
I am a computer beginner, this is the first time to ask, please forgive me, and sincerely thank you
#include <stdio.h>
#include <stdlib.h>
// 定义DocNode结构
struct DocNode {
int doc_id;
struct DocNode* next;
};
// 创建新的节点
struct DocNode* create_node(int doc_id) {
struct DocNode* new_node = (struct DocNode*)malloc(sizeof(struct DocNode));
new_node->doc_id = doc_id;
new_node->next = NULL;
return new_node;
}
int main(){
// 定义doc_lists数组,假设有两个链表
int query_count = 2;
struct DocNode* doc_lists[2];
// 初始化第一个链表: 338216 -> 338217 -> 379830
doc_lists[0] = create_node(338216);
doc_lists[0]->next = create_node(338217);
doc_lists[0]->next->next = create_node(379830);
// 初始化第二个链表: 123456 -> 789012
doc_lists[1] = create_node(123456);
doc_lists[1]->next = create_node(789012);
// 输出每个链表的内容
for(int i = 0; i < query_count; i++){
printf("doc[%d] is:",i);
struct DocNode* doc_list = doc_lists[i];
while(doc_list){
printf("%d ", doc_list->doc_id);
doc_list = doc_list->next;
}
printf("\n");
}
// 遍历并释放链表1中的节点
struct DocNode* temp_result = doc_lists[0];
printf("\nReleasing temp_result:\n");
while (temp_result) {
struct DocNode* temp = temp_result;
temp_result = temp_result->next;
printf("%d ", temp->doc_id);
free(temp);
}
printf("\n");
// 再次尝试输出链表内容
printf("\nTo check the result:\n");
for (int i = 0; i < query_count; i++) {
printf("doc[%d] is:",i);
struct DocNode* doc_list = doc_lists[i];
while(doc_list) {
printf("%d ", doc_list->doc_id);
doc_list = doc_list->next;
}
printf("\n");
}
return 0;
}
I am a computer beginner, this is the first time to ask, please forgive me, and sincerely thank you
The last question did not pass, I changed it again (now I put in the modified minimum running code), now the problem is, I want to use a *temp_list=doc_list[0], but my subsequent operation will delete some of the content of temp_list[0], This causes parts of the doc_list[0] to seem to have been modified for some reason. What can I do about this?
Unexpected modification of the c language linked list
struct DocNode *temp_result = doc_lists[0];
struct DocNode *temp2_result = doc_lists[0];
//doc_list[0]=338216 338217 379830
//输出这个doc_list[0]
for (int i = 0; i < query_count; i++) {
printf("doc[%d] is:",i);
struct DocNode *doc_list = doc_lists[i];
while(doc_list){
struct DocNode *temp = doc_list;
printf("%d ",temp->doc_id);
doc_list=doc_list->next;
}
printf("\n");
}
for(int i=1;i<query_count;i++){
printf("I is %d and temp_result is:",i-1);
//输出并释放temp_result
while(temp_result){
struct DocNode *temp = temp_result;
temp_result=temp_result->next;
printf("%d ",temp->doc_id);
free(temp);
temp=NULL;
}
printf("\n");
}
//再次输出doc_list[0]
printf("\nTo check the result\n");
for (int i = 0; i < query_count; i++) {
printf("doc[%d] is:",i);
struct DocNode *doc_list = doc_lists[i];
while(doc_list){
struct DocNode *temp = doc_list;
printf("%d ",temp->doc_id);
doc_list=doc_list->next;
//free(temp)
}
printf("\n");
}
The code above has three main parts:
- Output doc_list[0]: The result is doc[0] is:338216 338217 379830
- Assign *temp_result = doc_list[0]: Output each node of temp_result. The result is 338216 338217 379830, and each node of temp_result is freed using free(temp_result).
- Output doc_list[0] again: The result is doc[0] is:0 3
In the last for loop of the code above, if free(temp) is used to release doc_list[0], a double free error occurs. However, if free(temp) is not used to release doc_list[0], running the code multiple times results in a segmentation fault. It is suspected that the linked list is being misused, but it is still unclear why the final output is doc[0] is:0 3 instead of random values.
Possible Cause: Is the issue related to deep copying? (Based on related content, deep copying seems to require implementing a custom function. However, there is concern that deep copying could impact performance in cases involving large amounts of data.)
I am a computer beginner, this is the first time to ask, please forgive me, and sincerely thank you
Reviewed related materials, which suggest potential solutions for the segmentation fault in such cases, such as "initialize pointers to NULL when created" and "set the pointer to NULL after calling free()." However, these solutions did not resolve the issue.