Merge pull request soulmachine#47 from windpls/master

fix a bug in "Remove Duplicates from Sorted List"

C++/chapLinearList.tex

@@ -2217,7 +2217,7 @@ \subsubsection{迭代版}
     ListNode *deleteDuplicates(ListNode *head) {
         if (head == nullptr) return nullptr;
 
-        for (ListNode *prev = head, *cur = head->next; cur; cur = cur->next) {
+        for (ListNode *prev = head, *cur = head->next; cur; cur = prev->next) {
             if (prev->val == cur->val) {
                 prev->next = cur->next;
                 delete cur;