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Flatten 2D Vector

EasyNested Structures & Iterators

Implement an iterator to flatten a 2D vector. Support next() and has_next() operations.

Input: 2D vector as JSON, then operations separated by semicolons. Output results of next() calls.

Example:

Input:
[[1,2],[3],[4]]
next;next;next;has_next;next;has_next
Output:
1
2
3
True
4
False
Reasoning:
  • The input 2D vector [[1,2],[3],[4]] is initialized for iteration.
  • The next() operation is called three times, yielding the values 1, 2, and 3, which are the first elements of each of the first three sub-vectors.
  • The has_next() operation checks if there are more elements and returns True because there is still an element 4 left in the vector.
  • The next() operation is called again, yielding the value 4, which is the last element in the vector.
  • The final has_next() operation returns False because there are no more elements left to iterate over in the vector.

Constraints:

  • 0 <= rows <= 100
  • 0 <= cols <= 100
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Test Results

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