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res[i] = stack.length ? stack.at(-1) - i : 0;
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Anthropic was the only AI company cleared for use in classified settings—until Elon Musk’s xAI agreed to let the Pentagon use its AI in lawful situations. Google and OpenAI are used in unclassified settings but are in talks with the Defense Department about classified work.
（二）违反国家规定，收购铁路、油田、供电、电信、矿山、水利、测量和城市公用设施等废旧专用器材的；