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For singe elevator, we keep a global vector of floors in increasing order, such as a1 -> a2 -> a3 -> a4 -> a5 (1 -> 3 -> 4 -> 5 -> 7 -> 12), we also define 2 bit number as direction where 00 means idle, 01 means downward, 10 means upward, we also keep a global priority queue, where where ever some one from ai hold the button, then we calculate the distance based upon direction and highest or lowest floor number in current priority queue, and we insert that node into queue, we also keep a bit vector of size floor numbers, and if from some floor number someone hold button we set it to one, and when the elevator reach their we delete the entry from priority queue(topmost entry), set bitvector entry to false. this bitvector is used to avoid repeated entries at the same time from a same floor, this bit vector can be a hash function also when floor are not continuous.
- sonesh October 24, 2012