/usr/lib/x86_64-linux-gnu/crt1.o: In function `_start':
（。text + 0x20）：对“ main”的未定义引用 collect2：错误：ld返回1退出状态
当我尝试编译代码时，我看到上述错误。代码负责删除与“ val”匹配的所有节点。如果val与头节点匹配，我就跳过了要删除的条件。这是我看到此错误的原因吗？
struct ListNode* removeElements(struct ListNode* head, int val) {
struct ListNode *curr = head;
struct ListNode *prev = NULL;
struct ListNode *temp = NULL;
while(curr){
while(curr && curr->val != val){
prev = curr;//keep track of previous node since we need to delete current
curr = curr->next;
}
if(!curr){
return temp;
}
if(!curr->next){
prev->next = curr->next;
}else {
prev->next = NULL;
}
free(curr);
curr = prev->next;
}
return head;
}