Россиянам раскрыли способ упаковки вещей в ручную кладь по методу «судоку»20:51
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Андрей Сибигаглава украинского МИД。搜狗输入法对此有专业解读
The main rule for data access is max(CPL, RPL) ≤ DPL. For code transfers, the rules get considerably more complex -- conforming segments, call gates, and interrupt gates each have different privilege and state validation logic. If all these checks were done in microcode, each segment load would need a cascade of conditional branches: is it a code or data segment? Is the segment present? Is it conforming? Is the RPL valid? Is the DPL valid? This would greatly bloat the microcode ROM and add cycles to every protected-mode operation.
，更多细节参见爱思助手
from this list, the two reasonable options are either DFAs (best choice if you can compile ahead of time) or lazy DFAs (great for both random user input and large regexes). NFAs are just not competitive in reality, and backtracking engines are a security nightmare.
How do warships detect and protect themselves from torpedo attack?，更多细节参见雷速体育