diff --git a/assets/covers/chapter_data_structure.jpg b/assets/covers/chapter_data_structure.jpg index c877648dd..45a0d0e7c 100644 Binary files a/assets/covers/chapter_data_structure.jpg and b/assets/covers/chapter_data_structure.jpg differ diff --git a/assets/covers/chapter_divide_and_conquer.jpg b/assets/covers/chapter_divide_and_conquer.jpg index 6a62d9cc5..1336e171d 100644 Binary files a/assets/covers/chapter_divide_and_conquer.jpg and b/assets/covers/chapter_divide_and_conquer.jpg differ diff --git a/assets/covers/chapter_sorting.jpg b/assets/covers/chapter_sorting.jpg index 3fbce55c9..2e8023ecd 100644 Binary files a/assets/covers/chapter_sorting.jpg and b/assets/covers/chapter_sorting.jpg differ diff --git a/en/assets/covers/chapter_appendix.jpg b/en/assets/covers/chapter_appendix.jpg index f455b97ca..a1399ac94 100644 Binary files a/en/assets/covers/chapter_appendix.jpg and b/en/assets/covers/chapter_appendix.jpg differ diff --git a/en/assets/covers/chapter_array_and_linkedlist.jpg b/en/assets/covers/chapter_array_and_linkedlist.jpg index c033f7c92..d6997a55d 100644 Binary files a/en/assets/covers/chapter_array_and_linkedlist.jpg and b/en/assets/covers/chapter_array_and_linkedlist.jpg differ diff --git a/en/assets/covers/chapter_backtracking.jpg b/en/assets/covers/chapter_backtracking.jpg index b5ee69c89..d2d5f90a3 100644 Binary files a/en/assets/covers/chapter_backtracking.jpg and b/en/assets/covers/chapter_backtracking.jpg differ diff --git a/en/assets/covers/chapter_complexity_analysis.jpg b/en/assets/covers/chapter_complexity_analysis.jpg index be3d1cc43..04b079cf4 100644 Binary files a/en/assets/covers/chapter_complexity_analysis.jpg and b/en/assets/covers/chapter_complexity_analysis.jpg differ diff --git a/en/assets/covers/chapter_data_structure.jpg b/en/assets/covers/chapter_data_structure.jpg index c877648dd..22f1e6770 100644 Binary files a/en/assets/covers/chapter_data_structure.jpg and b/en/assets/covers/chapter_data_structure.jpg differ diff --git a/en/assets/covers/chapter_divide_and_conquer.jpg b/en/assets/covers/chapter_divide_and_conquer.jpg index 6a62d9cc5..4171446ad 100644 Binary files a/en/assets/covers/chapter_divide_and_conquer.jpg and b/en/assets/covers/chapter_divide_and_conquer.jpg differ diff --git a/en/assets/covers/chapter_dynamic_programming.jpg b/en/assets/covers/chapter_dynamic_programming.jpg index 376a8900c..b64eece5c 100644 Binary files a/en/assets/covers/chapter_dynamic_programming.jpg and b/en/assets/covers/chapter_dynamic_programming.jpg differ diff --git a/en/assets/covers/chapter_graph.jpg b/en/assets/covers/chapter_graph.jpg index 368fce371..c3daa59ad 100644 Binary files a/en/assets/covers/chapter_graph.jpg and b/en/assets/covers/chapter_graph.jpg differ diff --git a/en/assets/covers/chapter_greedy.jpg b/en/assets/covers/chapter_greedy.jpg index a64651745..ed8a68214 100644 Binary files a/en/assets/covers/chapter_greedy.jpg and b/en/assets/covers/chapter_greedy.jpg differ diff --git a/en/assets/covers/chapter_hashing.jpg b/en/assets/covers/chapter_hashing.jpg index 74fdf9a6d..e74403232 100644 Binary files a/en/assets/covers/chapter_hashing.jpg and b/en/assets/covers/chapter_hashing.jpg differ diff --git a/en/assets/covers/chapter_heap.jpg b/en/assets/covers/chapter_heap.jpg index 829bfbe11..b603826a3 100644 Binary files a/en/assets/covers/chapter_heap.jpg and b/en/assets/covers/chapter_heap.jpg differ diff --git a/en/assets/covers/chapter_introduction.jpg b/en/assets/covers/chapter_introduction.jpg index 5b80c7ee6..0c39cd596 100644 Binary files a/en/assets/covers/chapter_introduction.jpg and b/en/assets/covers/chapter_introduction.jpg differ diff --git a/en/assets/covers/chapter_preface.jpg b/en/assets/covers/chapter_preface.jpg index 4e295e015..2ba0de189 100644 Binary files a/en/assets/covers/chapter_preface.jpg and b/en/assets/covers/chapter_preface.jpg differ diff --git a/en/assets/covers/chapter_searching.jpg b/en/assets/covers/chapter_searching.jpg index 8dce9d89e..c6f50f15d 100644 Binary files a/en/assets/covers/chapter_searching.jpg and b/en/assets/covers/chapter_searching.jpg differ diff --git a/en/assets/covers/chapter_sorting.jpg b/en/assets/covers/chapter_sorting.jpg index 3fbce55c9..0f441e9c3 100644 Binary files a/en/assets/covers/chapter_sorting.jpg and b/en/assets/covers/chapter_sorting.jpg differ diff --git a/en/assets/covers/chapter_stack_and_queue.jpg b/en/assets/covers/chapter_stack_and_queue.jpg index 6642497b7..ccfd8b330 100644 Binary files a/en/assets/covers/chapter_stack_and_queue.jpg and b/en/assets/covers/chapter_stack_and_queue.jpg differ diff --git a/en/assets/covers/chapter_tree.jpg b/en/assets/covers/chapter_tree.jpg index 56c7b1491..50f449614 100644 Binary files a/en/assets/covers/chapter_tree.jpg and b/en/assets/covers/chapter_tree.jpg differ diff --git a/en/sitemap.xml.gz b/en/sitemap.xml.gz index c1ef6a2d3..29202e622 100644 Binary files a/en/sitemap.xml.gz and b/en/sitemap.xml.gz differ diff --git a/sitemap.xml.gz b/sitemap.xml.gz index 7cb938ed1..4aaeaa732 100644 Binary files a/sitemap.xml.gz and b/sitemap.xml.gz differ