@@ -0,0 +1,226 @@
+/**%0A * Problem:%0A * Determine whether a string is unique.%0A */%0A%0Apublic class Solution1 %7B%0A%09/**%0A%09 * Solution:%0A%09 *%0A%09 * Analysis:%0A%09 * Time Complexity:%0A%09 * Space Complexity:%0A%09 */%0A%09public static boolean isUnique(String str) %7B%0A%0A    %7D%0A%7D

Initialize chapter 1 solutions.