Merge pull request #665 from MrKeeplearning/main

[MrKeeplearning] Week1

Author: SamTheKorean

contains-duplicate/MrKeeplearning.java

@@ -0,0 +1,13 @@
+import java.util.*;
+
+class MrKeeplearningContainsDuplicate {
+    public boolean containsDuplicate(int[] nums) {
+        HashSet<Integer> hashSet = new HashSet<>();
+        for (int num : nums) {
+            if (!hashSet.add(num)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

valid-palindrome/MrKeeplearning.java

@@ -0,0 +1,6 @@
+class MrKeeplearningValidPalindrome {
+    public boolean isPalindrome(String s) {
+
+        return false;
+    }
+}