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j-next = to_be_deleted[classno];
，更多细节参见搜狗输入法2026
Trump orders federal agencies to ‘immediately cease’ using Anthropic technology
all of the optimizations described above. Then at the very end of
思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。