* feat(chapter_dynamic_programming): Add js and ts codes for chapter 14.1
* style(chapter_dynamic_programming): format code
* refactor(chapter_dynamic_programming): remove main definition and add type
* feat(chapter_backtracking): Add js and ts codes for chapter 13.3
* feat(chapter_divide_and_conquer): Add js and ts codes for chapter 12.2
* feat(chapter_divide_and_conquer): Add js and ts codes for chapter 12.3
* feat(chapter_divide_and_conquer): Add js and ts codes for chapter 12.4
* style(chapter_divide_and_conquer): fix typo
* refactor: Use === instead of == in js and ts
William Yuan