Create 2058-find-the-minimum-and-maximum-number-of-nodes-between-critical-points.js

Author: everthis

2058-find-the-minimum-and-maximum-number-of-nodes-between-critical-points.js

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+/**
+ * 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 {number[]}
+ */
+const nodesBetweenCriticalPoints = function(head) {
+  const arr = []
+  let cur = head
+  while(cur) {
+    arr.push(cur.val)
+    cur = cur.next
+  }
+  const idxArr = []
+  const n = arr.length
+  for(let i = 1; i < n - 1; i++) {
+    if((arr[i] > arr[i - 1] && arr[i] > arr[i + 1]) || (arr[i] < arr[i - 1] && arr[i] < arr[i + 1])) {
+      idxArr.push(i)
+    }
+  }
+  
+  let min = Infinity, max = -1
+  for(let i = 1; i < idxArr.length; i++) {
+    if(idxArr[i] - idxArr[i - 1] < min) min = idxArr[i] - idxArr[i - 1]
+  }
+  if(idxArr.length > 1) max = idxArr[idxArr.length - 1] - idxArr[0]
+  return [min === Infinity ? -1 : min, max]
+};