Create 1512-number-of-good-pairs.js

Author: everthis

1512-number-of-good-pairs.js

@@ -0,0 +1,11 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+const numIdenticalPairs = function(nums) {
+  let res = 0, count = Array(101).fill(0)
+  for(let e of nums) {
+    res += count[e]++
+  }
+  return res
+};