Use large vector<bool> instead of set<pid>
vector<bool> uses bitsets, so we actually only use 12k memory to store all 3 possible PID info tables. PID checkup will be now become O(1) instead of O(logn). P.S. The reason why we don't use unordered_map is because including it will result in significant binary size increase (might be due to the complex hash table STL implementation? I really don't know).
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