solved Contains Duplicate

Author: wclee2265

contains-duplicate/wclee2265.cpp

@@ -0,0 +1,13 @@
+// https://leetcode.com/problems/contains-duplicate/
+
+class Solution {
+public:
+    bool containsDuplicate(vector<int>& nums) {
+        unordered_map<int, bool> hm;
+        for(int x : nums) {
+            if(hm[x]) return true;
+            hm[x] = true;
+        }
+        return false;        
+    }
+};