Merge pull request neetcode-gh#888 from Vitali-Matteo/patch-2

Create 1512-Number-Of-Good-Pairs.cpp

Author: Ahmad-A0

cpp/1512-Number-Of-Good-Pairs.cpp

@@ -0,0 +1,20 @@
+class Solution { 
+        unordered_map<int, int> Memo = {};    
+        int numIdenticalPairs(vector<int> & nums){            
+            unordered_map<int, int> Memo;            
+            int i, k;            
+            int NGood;            
+            NGood = 0;            
+            Memo = {};            
+            for(int & i : nums){                
+                if(Memo.find(i) == Memo.end()){                    
+                    Memo.insert(make_pair(i, 1));                
+                }
+                else{                    
+                    NGood = NGood + Memo[i];                    
+                    Memo[i]++;                    
+                }                
+            }            
+            return NGood;            
+        }    
+};