diff --git a/082_remove_duplicates_from_sorted_list_ii/Makefile b/082_remove_duplicates_from_sorted_list_ii/Makefile
new file mode 100644
index 0000000..5cf5932
--- /dev/null
+++ b/082_remove_duplicates_from_sorted_list_ii/Makefile
@@ -0,0 +1,2 @@
+all:
+	gcc -O2 -o test rm_dup.c
diff --git a/082_remove_duplicates_from_sorted_list_ii/rm_dup.c b/082_remove_duplicates_from_sorted_list_ii/rm_dup.c
new file mode 100644
index 0000000..c451d79
--- /dev/null
+++ b/082_remove_duplicates_from_sorted_list_ii/rm_dup.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct ListNode {
+    int val;
+    struct ListNode *next;
+};
+
+struct ListNode* deleteDuplicates(struct ListNode* head) {
+    struct ListNode dummy;
+    struct ListNode *p, *next, *prev;
+    prev = &dummy;
+    dummy.next = head;
+    p = next = head;
+    while (p != NULL) {
+        while (next != NULL && next->val == p->val) {
+            next = next->next;
+        }
+        if (p->next == next) {
+            prev = p;
+        } else {
+            prev->next = next;
+        }
+        p = next;
+    }
+    return dummy.next;
+}
+
+int main(int argc, char **argv)
+{
+    int i;
+    struct ListNode *head = NULL;
+    struct ListNode *prev = NULL;
+    struct ListNode *p;
+    for (i = 0; i < argc - 1; i++) {
+        p = malloc(sizeof(*p));
+        p->val = atoi(argv[i + 1]);
+        p->next = NULL;
+        if (head == NULL) {
+            head = p;
+            prev = head;
+        } else {
+            prev->next = p;
+            prev = p;
+        }
+    }
+    p = deleteDuplicates(head);
+    while (p != NULL) {
+        printf("%d ", p->val);
+        p = p->next;
+    }
+    printf("\n");
+    return 0;
+}
diff --git a/083_remove_duplicates_from_sorted_list/Makefile b/083_remove_duplicates_from_sorted_list/Makefile
new file mode 100644
index 0000000..5cf5932
--- /dev/null
+++ b/083_remove_duplicates_from_sorted_list/Makefile
@@ -0,0 +1,2 @@
+all:
+	gcc -O2 -o test rm_dup.c
diff --git a/083_remove_duplicates_from_sorted_list/rm_dup.c b/083_remove_duplicates_from_sorted_list/rm_dup.c
new file mode 100644
index 0000000..d5de716
--- /dev/null
+++ b/083_remove_duplicates_from_sorted_list/rm_dup.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct ListNode {
+    int val;
+    struct ListNode *next;
+};
+
+struct ListNode* deleteDuplicates(struct ListNode* head) {
+    struct ListNode *p, *next;
+    p = next = head;
+    while (p != NULL) {
+        while (next != NULL && next->val == p->val) {
+            next = next->next;
+        }
+        p->next = next;
+        p = next;
+    }
+    return head;
+}
+
+int main(int argc, char **argv)
+{
+    int i;
+    struct ListNode *head = NULL;
+    struct ListNode *prev = NULL;
+    struct ListNode *p;
+    for (i = 0; i < argc - 1; i++) {
+        p = malloc(sizeof(*p));
+        p->val = atoi(argv[i + 1]);
+        p->next = NULL;
+        if (head == NULL) {
+            head = p;
+            prev = head;
+        } else {
+            prev->next = p;
+            prev = p;
+        }
+    }
+    p = deleteDuplicates(head);
+    while (p != NULL) {
+        printf("%d ", p->val);
+        p = p->next;
+    }
+    printf("\n");
+    return 0;
+}