tc, sc 주석 추가

Author: geegong

contains-duplicate/Geegong.java

@@ -5,6 +5,12 @@
 public class Geegong {
 
 
+    /**
+     * time complexity : O(n)
+     * space complexity : o(n)
+     * @param nums
+     * @return
+     */
     public boolean containsDuplicate(int[] nums) {
         HashSet<Integer> uniques = new HashSet<>();