contains-duplicate solution

Author: PDKhan

contains-duplicate/PDKhan.cpp

@@ -0,0 +1,15 @@
+class Solution {
+    public:
+        bool containsDuplicate(vector<int>& nums) {
+            unordered_map<int, int> map;
+    
+            for(int i = 0; i < nums.size(); i++){
+                map[nums[i]]++;
+                
+                if(map[nums[i]] == 2)
+                    return true;
+            }
+    
+            return false;
+        }
+    };