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* Add kotlin code block for chapter_hashing * Add kotlin code block for chapter_heap. * Add kotlin code block for chapter_stack_and_queue and chapter_tree * fix indentation * Update binary_tree.md * style(kotlin): simplify code and improve readability. * simplify kt code for chapter_computational_complexity. * style(kotlin): replace ArrayList with MutableList. * Update subset_sum_i.kt Use kotlin api instead of java. * Update subset_sum_ii.kt use kotlin api instead of java * style(kotlin): replace ArrayList with mutablelist. --------- Co-authored-by: Yudong Jin <krahets@163.com>