Create 2150-find-all-lonely-numbers-in-the-array.js

Author: everthis

2150-find-all-lonely-numbers-in-the-array.js

@@ -0,0 +1,31 @@
+/**
+ * @param {number[]} nums
+ * @return {number[]}
+ */
+var findLonely = function(nums) {
+  nums.sort((a, b) => a - b)
+  const cnt = {}
+  for(let e of nums) {
+    if(cnt[e] == null) cnt[e] = 0
+    cnt[e]++
+  }
+  // console.log(cnt)
+  const res = []
+  for(let i = 0, n = nums.length; i < n; i++) {
+    if(i === 0){
+      if(nums[i + 1] !== nums[i] + 1 && cnt[nums[i]] === 1) {
+        res.push(nums[i])  
+      }
+    } 
+    else if(i === n - 1 ) {
+      if(nums[i] !== nums[i - 1] + 1 && cnt[nums[i]] === 1) {
+        res.push(nums[i])
+      }
+    }
+    else if(cnt[nums[i]] === 1 && nums[i] !== nums[i - 1] + 1 && nums[i] !== nums[i + 1] - 1) {
+      res.push(nums[i])
+    }
+  }
+  
+  return res
+};