contains duplicate solution

Author: leebeanbin

contains-duplicate/leebeanbin.java

@@ -0,0 +1,18 @@
+import java.util.HashSet;
+
+class Solution {
+	public boolean containsDuplicate(int[] nums) {
+		HashSet<Integer> arr = new HashSet<Integer>();
+		boolean answer = false;
+
+		for(int num : nums){
+			arr.add(num);
+		}
+
+		if(nums.length != arr.size()){
+			answer = true;
+		}
+
+		return answer;
+	}
+}