Initial commit

Medium/sort-list/solution.c

@@ -0,0 +1,32 @@
+struct ListNode *merge(struct ListNode *left, struct ListNode *right) {
+    if (!left) {
+        return right;
+    }
+    if (!right) {
+        return left;
+    }
+
+    if (left->val < right->val) {
+        left->next = merge(left->next, right);
+        return left;
+    } else {
+        right->next = merge(left, right->next);
+        return right;
+    }
+}
+
+struct ListNode *sortList(struct ListNode *head) {
+    if (!head || !head->next) {
+        return head;
+    }
+    struct ListNode *fast, *midd, *bmid;
+    fast = midd = head;
+    while (fast && fast->next) {
+        bmid = midd;
+        fast = fast->next->next;
+        midd = midd->next;
+    }
+
+    bmid->next = NULL;
+    return merge(sortList(head), sortList(midd));
+}