Rectangle Collection With Undo
OpenAI● HardFULLTIMEPHONE SCREENProblem statement
Process an ordered sequence of operations on an initially empty collection of axis-aligned rectangles. Coordinates and boundaries are inclusive.
The problem statement continues
ProExamples
Example 1
operations = ["ADD a 0 0 4 4","ADD b 2 2 6 6","REMOVE_AT 3 3","UNDO","REMOVE_ALL 3 3"]return = ["a","a,b","a","a,b","EMPTY"]The point removal chooses newer rectangle b; undo restores it; the batch removal then removes both.
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