Time: 15 ms (48.47%), Space: 70.4 MB (39.55%) - LeetHub

Author: maniezhilan

217-contains-duplicate/217-contains-duplicate.java

@@ -0,0 +1,13 @@
+class Solution {
+    public boolean containsDuplicate(int[] nums) {
+        Set<Integer> set = new HashSet<>(nums.length);
+        for(int num : nums){
+            if(set.contains(num)){
+                return true;
+            }
+            set.add(num);
+        }
+        return false;
+        
+    }
+}