Create 2181-merge-nodes-in-between-zeros.js

Author: everthis

2181-merge-nodes-in-between-zeros.js

@@ -0,0 +1,37 @@
+/**
+ * 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 mergeNodes = function(head) {
+  const dummy = new ListNode()
+  const arr = []
+  let cur = head
+  while(cur) {
+    arr.push(cur)
+    cur = cur.next
+  }
+  let tail = dummy
+  let lastIdx = 0, sum = 0
+  if(arr.length) {
+    for(let i = 1; i < arr.length; i++) {
+      const tmp = arr[i]
+      if(tmp.val === 0 && sum !== 0) {
+        lastIdx = i
+        tail.next = new ListNode(sum)
+        tail = tail.next
+        sum = 0
+      } else {
+        sum += tmp.val
+      }
+    }
+  }
+  
+  return dummy.next
+};