Create 532-k-diff-pairs-in-an-array.js

Author: everthis

532-k-diff-pairs-in-an-array.js

@@ -0,0 +1,28 @@
+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number}
+ */
+const findPairs = function(nums, k) {
+    if(k < 0) return 0
+    let count = 0
+    const hash = {}
+    for(let el of nums) {
+        if (hash.hasOwnProperty(el)) {
+          if(k === 0 && hash[el] === 1) {
+            count++
+          }
+          hash[el] += 1
+        } else {
+          if (hash.hasOwnProperty(el - k)) {
+              count++
+          }
+          if (hash.hasOwnProperty(el + k)) {
+              count++
+          }
+          hash[el] = 1
+        }
+    }
+
+    return count
+};