Fixes minor bug in subsetsum implementation

src/cse332/backtracking/SubsetSum.java

 package cse332.backtracking;
 
-import java.lang.reflect.Array;
+import java.util.Arrays;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -14,8 +14,7 @@ public class SubsetSum {
 
 	@SuppressWarnings("unchecked")
 	private static <E> E[] rest(E[] list) {
-		E[] rest = (E[]) Array.newInstance(list.getClass().getComponentType(), list.length - 1);
-		return rest;
+		return Arrays.copyOfRange(list, 1, list.length);
 	}
 	
 	
@@ -86,4 +85,4 @@ public class SubsetSum {
 
 		return output;
 	}
-}
\ No newline at end of file
+}