Is this a SLAM or ACML kind of problem?

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So let's say I need to construct an autonomous robot that has to navigate a premade map where obstacles will be randomly placed at the start of every round, but the wall placement and everything else in the map stays the same. Would I use SLAM to generate a new map (for the new obstacles) or should I just implement an ACML type of solution since I already know what the map looks like and since it won't change significantly; the robot just has to avoid the objects (or hit them if necessary)?