feat: 문제풀이 추가

Author: JEONGHWANMIN

reverse-linked-list/hwanmini.js

@@ -0,0 +1,28 @@
+// 시간복잡도: O(n)
+// 공간복잡도: O(1)
+
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+var reverseList = function(head) {
+    let curNode = head
+    let preNode = null
+
+    while (curNode) {
+        const nextNode = curNode.next
+        curNode.next = preNode
+        preNode = curNode
+        curNode = nextNode
+    }
+
+
+    return preNode
+};