Fix access error when printArray(arr, 0) (#432)

* fix(codes/cpp): Memory leak fix: the space was not freed when pop removed the element.

* fix(codes/cpp): Fix access error when printArray(arr, 0)

* Update PrintUtil.hpp

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/cpp/include/PrintUtil.hpp

@@ -102,7 +102,7 @@ class PrintUtil {
             for (int i = 0; i < n - 1; i++) {
                 cout << arr[i] << ", ";
             }
-            if (n>=1)
+            if (n >= 1)
                 cout << arr[n - 1] << "]" << endl;
             else
                 cout << "]" << endl;