Leetcode Problem 251. Flatten 2D Vector

251. Flatten 2D Vector

Leetcode Solutions

Initialize the outer and inner indices to 0.
Implement the advanceToNext method to find the next available element:
- Increment outer if inner is out of bounds for the current sub-vector.
- Skip over empty sub-vectors by incrementing outer until a non-empty sub-vector is found.
- If a valid element is found, set inner to point to it.
In hasNext, call advanceToNext and return whether the current indices point to a valid element.
In next, return the element at the current indices, then increment inner and call advanceToNext to prepare for the next call.

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