迭代器

二叉搜索树迭代器

Implement an iterator for in-order traversal of a binary search tree (BST), maintaining traversal state with stack-based…

窥视迭代器

Design an iterator with peek functionality, adding to the standard next and hasNext operations for efficient element acc…

扁平化嵌套列表迭代器

Implement an iterator to flatten a nested list of integers, accounting for potential nesting levels.

RLE 迭代器

Design an efficient iterator for a run-length encoded array, handling large counts and sequential access correctly every…

字母组合迭代器

Implement an iterator that generates all combinations of a given length using efficient backtracking with pruning.