Car Fleet
Given target position, car positions, and speeds Return number of car fleets that will arrive at destination Cars can't pass but can catch up and form fleets Example: target=12, position=[10,8,0,5,3], speed=[2,4,1,1,3] => 3
Car Fleet is all about maintaining a clear stack meaning as you process input. Interviewers love it because it reveals your stack invariants and your edge-case discipline. Keep the stack invariant explicit; if it breaks, everything downstream breaks too.
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