Added solution to 532. K-diff Pairs in an Array

Author: ignacio-chiazzo

532. K-diff Pairs in an Array.js

@@ -0,0 +1,24 @@
+var findPairs = function(nums, k) {
+  if(nums.length === 0 || k < 0) {
+    return 0;
+  }
+  var dict = {};
+  var count = 0;
+
+  nums.sort(function(a,b){ return a - b });
+  for(var i = 0; i < nums.length; i++) {
+    var number = nums[i];
+    dict[number] = (dict[number] === undefined)? 1 : dict[number] += dict[number];
+  }
+  for(var numb in dict) {
+    numb = parseInt(numb);
+    if(k === 0) {
+      if(dict[numb] > 1) {
+        count++;
+      }
+    } else if(dict[numb + k] !== undefined){
+      count++;
+    }
+  }
+  return count;
+};